feat: 初始化 AI Code Diff Preview 插件项目

- 核心架构搭建：四层架构设计（触发层、隔离层、Diff引擎、UI层）
- 快照管理器：管理 Base/Suggest 双版本，隔离 AI 生成代码
- Diff 引擎：基于 Myers 算法计算差异，生成变更块
- 内联装饰器：红绿高亮显示删除/新增行
- CodeLens 提供器：提供 Accept/Reject 按钮
- 事务处理：Accept/Reject 原子化操作
- Claude Hooks 集成：支持 after_code_edit/after_write_file 事件
- 状态栏显示：实时显示变更状态
- 基础测试用例：7 个测试全部通过

技术栈：TypeScript + VSCode Extension API + diff 库 + esbuild

package.json

@@ -0,0 +1,122 @@
+{
+  "name": "ai-diff-preview",
+  "displayName": "AI Code Diff Preview",
+  "description": "类 Cursor 的 AI 代码差异预览插件，支持 Accept/Reject 操作",
+  "version": "0.1.0",
+  "publisher": "your-publisher-name",
+  "engines": {
+    "vscode": "^1.85.0"
+  },
+  "categories": [
+    "Linters",
+    "Programming Languages",
+    "Other"
+  ],
+  "activationEvents": [],
+  "main": "./dist/extension.js",
+  "contributes": {
+    "commands": [
+      {
+        "command": "aiDiffPreview.acceptChunk",
+        "title": "AI Diff: 接受当前变更块",
+        "icon": "$(check)"
+      },
+      {
+        "command": "aiDiffPreview.rejectChunk",
+        "title": "AI Diff: 拒绝当前变更块",
+        "icon": "$(close)"
+      },
+      {
+        "command": "aiDiffPreview.acceptAll",
+        "title": "AI Diff: 接受所有变更",
+        "icon": "$(check-all)"
+      },
+      {
+        "command": "aiDiffPreview.rejectAll",
+        "title": "AI Diff: 拒绝所有变更",
+        "icon": "$(trash)"
+      },
+      {
+        "command": "aiDiffPreview.showDiffPanel",
+        "title": "AI Diff: 显示 Diff 面板",
+        "icon": "$(diff)"
+      }
+    ],
+    "keybindings": [
+      {
+        "command": "aiDiffPreview.acceptChunk",
+        "key": "tab",
+        "when": "aiDiffPreview.isActive"
+      },
+      {
+        "command": "aiDiffPreview.rejectAll",
+        "key": "escape",
+        "when": "aiDiffPreview.isActive"
+      },
+      {
+        "command": "aiDiffPreview.acceptAll",
+        "key": "ctrl+shift+a",
+        "mac": "cmd+shift+a",
+        "when": "aiDiffPreview.isActive"
+      },
+      {
+        "command": "aiDiffPreview.rejectAll",
+        "key": "ctrl+shift+r",
+        "mac": "cmd+shift+r",
+        "when": "aiDiffPreview.isActive"
+      }
+    ],
+    "configuration": {
+      "title": "AI Diff Preview",
+      "properties": {
+        "aiDiffPreview.enableAutoTrigger": {
+          "type": "boolean",
+          "default": true,
+          "description": "启用 Claude Hooks 自动触发"
+        },
+        "aiDiffPreview.showInlineButtons": {
+          "type": "boolean",
+          "default": true,
+          "description": "显示内联 Accept/Reject 按钮"
+        },
+        "aiDiffPreview.autoLint": {
+          "type": "boolean",
+          "default": true,
+          "description": "Diff 预览时自动运行 Lint 检查"
+        },
+        "aiDiffPreview.maxFileSize": {
+          "type": "number",
+          "default": 100000,
+          "description": "最大处理文件大小（字符数）"
+        }
+      }
+    }
+  },
+  "scripts": {
+    "vscode:prepublish": "npm run build",
+    "build": "esbuild ./src/extension.ts --bundle --outfile=dist/extension.js --external:vscode --format=cjs --platform=node --minify",
+    "watch": "esbuild ./src/extension.ts --bundle --outfile=dist/extension.js --external:vscode --format=cjs --platform=node --sourcemap --watch",
+    "lint": "eslint src --ext ts",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "package": "vsce package"
+  },
+  "devDependencies": {
+    "@types/diff": "^5.0.0",
+    "@types/node": "^20.0.0",
+    "@types/uuid": "^9.0.0",
+    "@types/vscode": "^1.85.0",
+    "@typescript-eslint/eslint-plugin": "^6.0.0",
+    "@typescript-eslint/parser": "^6.0.0",
+    "@vscode/test-electron": "^2.3.0",
+    "esbuild": "^0.19.0",
+    "eslint": "^8.0.0",
+    "prettier": "^3.0.0",
+    "typescript": "^5.3.0",
+    "vitest": "^1.0.0"
+  },
+  "dependencies": {
+    "diff": "^5.0.0",
+    "uuid": "^9.0.0"
+  }
+}