chore: 初始化项目配置和示例代码

- 添加 .gitignore 文件，配置忽略的文件和目录
- 创建 compiler.xml，设置编译器配置和注解处理- 添加数据源配置和编码设置
- 新增示例控制器 ExampleController
- 创建项目根目录结构和基本配置文件

.idea/workspace.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="2b30066e-d17d-4f56-b7e3-9cb858f333e4" name="Changes" comment="">
+      <change beforePath="$PROJECT_DIR$/.idea/.gitignore" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/Campus_second-hand_trading_platform.iml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/misc.xml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/modules.xml" beforeDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/vcs.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/vcs.xml" afterDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="ProjectColorInfo"><![CDATA[{
+  "customColor": "",
+  "associatedIndex": 8
+}]]></component>
+  <component name="ProjectId" id="2os8cUmmlcOMfjAWQP89BPw32Ux" />
+  <component name="ProjectViewState">
+    <option name="autoscrollFromSource" value="true" />
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showExcludedFiles" value="false" />
+    <option name="showLibraryContents" value="true" />
+    <option name="showScratchesAndConsoles" value="false" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "git-widget-placeholder": "main",
+    "kotlin-language-version-configured": "true",
+    "nodejs_package_manager_path": "npm",
+    "vue.rearranger.settings.migration": "true"
+  }
+}]]></component>
+  <component name="SharedIndexes">
+    <attachedChunks>
+      <set>
+        <option value="bundled-jdk-9823dce3aa75-28b599e66164-intellij.indexing.shared.core-IU-242.23726.103" />
+        <option value="bundled-js-predefined-d6986cc7102b-5c90d61e3bab-JavaScript-IU-242.23726.103" />
+      </set>
+    </attachedChunks>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="application-level" UseSingleDictionary="true" transferred="true" />
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="2b30066e-d17d-4f56-b7e3-9cb858f333e4" name="Changes" comment="" />
+      <created>1731647002005</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1731647002005</updated>
+      <workItem from="1731647003871" duration="13000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="3" />
+  </component>
+</project>

trading_platform/.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

trading_platform/.idea/compiler.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile default="true" name="Default" enabled="true" />
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
+        <outputRelativeToContentRoot value="true" />
+        <module name="trading_platform" />
+      </profile>
+    </annotationProcessing>
+  </component>
+  <component name="JavacSettings">
+    <option name="ADDITIONAL_OPTIONS_OVERRIDE">
+      <module name="trading_platform" options="-parameters" />
+    </option>
+  </component>
+</project>

trading_platform/.idea/dataSources.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DataSourceManagerImpl" format="xml" multifile-model="true">
+    <data-source source="LOCAL" name="secondhandtransactions@localhost" uuid="27e105d3-7602-4a8a-b0d3-ab289a1b2fdb">
+      <driver-ref>mysql.8</driver-ref>
+      <synchronize>true</synchronize>
+      <imported>true</imported>
+      <remarks>$PROJECT_DIR$/src/main/resources/application.yml</remarks>
+      <jdbc-driver>com.mysql.cj.jdbc.Driver</jdbc-driver>
+      <jdbc-url>jdbc:mysql://localhost:3306/secondhandtransactions?useUnicode=true&amp;characterEncoding=utf-8&amp;useSSL=false&amp;serverTimezone=Asia/Shanghai</jdbc-url>
+      <jdbc-additional-properties>
+        <property name="com.intellij.clouds.kubernetes.db.host.port" />
+        <property name="com.intellij.clouds.kubernetes.db.enabled" value="false" />
+        <property name="com.intellij.clouds.kubernetes.db.resource.type" value="Deployment" />
+        <property name="com.intellij.clouds.kubernetes.db.container.port" />
+      </jdbc-additional-properties>
+      <working-dir>$ProjectFileDir$</working-dir>
+    </data-source>
+  </component>
+</project>

trading_platform/.idea/encodings.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+  </component>
+</project>

trading_platform/.idea/jarRepositories.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Central Repository" />
+      <option name="url" value="https://repo.maven.apache.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+  </component>
+</project>

trading_platform/.idea/misc.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK" />
+</project>

trading_platform/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

trading_platform/src/main/java/com/trading_platform/controller/ExampleController.java

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+package com.trading_platform.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+
+@RestController
+public class ExampleController {
+
+    @GetMapping("/example")
+    public String example() {
+        return "Hello, World!";
+    }
+}

trading_platform/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst

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+com\trading_platform\config\OpenApiConfig.class
+com\trading_platform\TradingPlatformApplication.class
+com\trading_platform\interceptors\LoginInterceptor.class
+com\trading_platform\config\WebConfig.class

trading_platform/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

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+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\config\OpenApiConfig.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\config\WebConfig.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\controller\UsersController.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\entity\Result.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\entity\Users.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\exception\GlobalExceptionHandler.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\interceptors\LoginInterceptor.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\mapper\UsersMapper.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\service\impl\UsersServiceImpl.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\service\UsersService.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\TradingPlatformApplication.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\utils\JwtUtil.java
+C:\Users\Admin\Desktop\Campus_second-hand_trading_platform\trading_platform\src\main\java\com\trading_platform\utils\Sha256Util.java