feat: 接入真实微博OAuth 2.0登录

**实现内容**：

1. **微博OAuth 2.0登录**
   - 实现完整的OAuth授权流程
   - 支持开发模式（模拟数据）和生产模式（真实API）
   - 自动判断运行模式，无需手动切换

2. **微博账号绑定**
   - 获取授权URL接口：GET /api/weibo/bind-url
   - 处理授权回调：GET /api/weibo/callback
   - 绑定状态查询：GET /api/weibo/status
   - 解除绑定：DELETE /api/weibo/unbind

3. **超话功能（模拟实现）**
   - 超话列表查询：GET /api/topic/list
   - 单个签到：POST /api/topic/signin
   - 批量签到：POST /api/topic/batch-signin
   - 签到记录：GET /api/topic/records
   - 同步超话：POST /api/topic/sync

4. **环境配置**
   - 新增server/.env配置文件
   - 支持环境变量配置微博App Key/Secret
   - 安装@nestjs/config依赖

5. **技术文档**
   - 创建WEIBO_INTEGRATION_GUIDE.md完整接入指南
   - 包含微博开放平台配置步骤
   - 提供OAuth 2.0授权流程说明
   - 详细的风险提示和安全建议

**重要说明**：
- 超话功能目前使用模拟数据，真实实现需要调用微博移动端非官方API
- 非官方API存在法律和技术风险，使用需谨慎
- 系统已预留真实API接口实现位置和注释说明

pnpm-lock.yaml

@@ -173,6 +173,9 @@ importers:
       '@nestjs/common':
         specifier: ^10.4.15
         version: 10.4.20(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      '@nestjs/config':
+        specifier: ^4.0.3
+        version: 4.0.3(@nestjs/common@10.4.20(reflect-metadata@0.2.2)(rxjs@7.8.2))(rxjs@7.8.2)
       '@nestjs/core':
         specifier: ^10.4.15
         version: 10.4.20(@nestjs/common@10.4.20(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.20)(reflect-metadata@0.2.2)(rxjs@7.8.2)
@@ -3108,6 +3111,12 @@ packages:
       class-validator:
         optional: true
 
+  '@nestjs/config@4.0.3':
+    resolution: {integrity: sha512-FQ3M3Ohqfl+nHAn5tp7++wUQw0f2nAk+SFKe8EpNRnIifPqvfJP6JQxPKtFLMOHbyer4X646prFG4zSRYEssQQ==}
+    peerDependencies:
+      '@nestjs/common': ^10.0.0 || ^11.0.0
+      rxjs: ^7.1.0
+
   '@nestjs/core@10.4.20':
     resolution: {integrity: sha512-kRdtyKA3+Tu70N3RQ4JgmO1E3LzAMs/eppj7SfjabC7TgqNWoS4RLhWl4BqmsNVmjj6D5jgfPVtHtgYkU3AfpQ==}
     peerDependencies:
@@ -5961,6 +5970,10 @@ packages:
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     engines: {node: '>=12'}
 
+  dotenv-expand@12.0.3:
+    resolution: {integrity: sha512-uc47g4b+4k/M/SeaW1y4OApx+mtLWl92l5LMPP0GNXctZqELk+YGgOPIIC5elYmUH4OuoK3JLhuRUYegeySiFA==}
+    engines: {node: '>=12'}
+
   dotenv@16.6.1:
     resolution: {integrity: sha512-uBq4egWHTcTt33a72vpSG0z3HnPuIl6NqYcTrKEg2azoEyl2hpW0zqlxysq2pK9HlDIHyHyakeYaYnSAwd8bow==}
     engines: {node: '>=12'}
@@ -7820,6 +7833,9 @@ packages:
   lodash@4.17.21:
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+  lodash@4.17.23:
+    resolution: {integrity: sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w==}
+
   log-symbols@4.1.0:
     resolution: {integrity: sha512-8XPvpAA8uyhfteu8pIvQxpJZ7SYYdpUivZpGy6sFsBuKRY/7rQGavedeB8aK+Zkyq6upMFVL/9AW6vOYzfRyLg==}
     engines: {node: '>=10'}
@@ -14126,6 +14142,14 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
+  '@nestjs/config@4.0.3(@nestjs/common@10.4.20(reflect-metadata@0.2.2)(rxjs@7.8.2))(rxjs@7.8.2)':
+    dependencies:
+      '@nestjs/common': 10.4.20(reflect-metadata@0.2.2)(rxjs@7.8.2)
+      dotenv: 17.2.3
+      dotenv-expand: 12.0.3
+      lodash: 4.17.23
+      rxjs: 7.8.2
+
   '@nestjs/core@10.4.20(@nestjs/common@10.4.20(reflect-metadata@0.2.2)(rxjs@7.8.2))(@nestjs/platform-express@10.4.20)(reflect-metadata@0.2.2)(rxjs@7.8.2)':
     dependencies:
       '@nestjs/common': 10.4.20(reflect-metadata@0.2.2)(rxjs@7.8.2)
@@ -17711,6 +17735,10 @@ snapshots:
     dependencies:
       dotenv: 16.6.1
 
+  dotenv-expand@12.0.3:
+    dependencies:
+      dotenv: 16.6.1
+
   dotenv@16.6.1: {}
 
   dotenv@17.2.3: {}
@@ -19880,6 +19908,8 @@ snapshots:
 
   lodash@4.17.21: {}
 
+  lodash@4.17.23: {}
+
   log-symbols@4.1.0:
     dependencies:
       chalk: 4.1.2