chore: 添加 VSCode 推荐扩展列表并固定 Bun 运行时版本

- 创建 .vscode/extensions.json 推荐 Biome、TypeScript、Bun、EditorConfig 扩展
- 添加 .tool-versions 固定 bun 1.3.13
- package.json engines.bun 收紧为 >=1.3.0
- .gitignore 改用 .vscode/* + 例外以允许 extensions.json 提交

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -5,7 +5,8 @@ coverage
 .env
 *.log
 .idea
-.vscode
+.vscode/*
+!.vscode/extensions.json
 *.suo
 *.lock
 src/utils/vendor/

.tool-versions

@@ -0,0 +1 @@
+bun 1.3.13

.vscode/extensions.json

@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "biomejs.biome",
+    "ms-typescript.typescript",
+    "oven.bun-vscode",
+    "editorconfig.editorconfig"
+  ]
+}

package.json

@@ -22,7 +22,7 @@
     "repl"
   ],
   "engines": {
-    "bun": ">=1.2.0"
+    "bun": ">=1.3.0"
   },
   "bin": {
     "ccb": "dist/cli-node.js",