feat: 添加环境变量管理与通用工具支持

- 添加 @t3-oss/env-core 依赖并指定其版本及对 peerDependencies 和 optionalPeers 的要求
- 添加 OpenCode 配置文件，定义本地和远程 MCP 服务以支持 shadcn 和 tanstack 工具集成。
- 添加 @t3-oss/env-core 依赖以支持环境变量配置管理
- 使用 t3-oss/env-core 创建环境变量配置，支持服务器和客户端环境变量解析，并启用空字符串转为 undefined。
- 添加工具函数库以支持项目中的通用功能需求

bun.lock

@@ -5,6 +5,7 @@
     "": {
       "name": "fullstack-starter",
       "dependencies": {
+        "@t3-oss/env-core": "^0.13.10",
         "@tanstack/react-query": "^5.90.18",
         "@tanstack/react-query-devtools": "^5.91.2",
         "@tanstack/react-router": "^1.150.0",
@@ -388,6 +389,8 @@
 
     "@solid-primitives/utils": ["@solid-primitives/utils@6.3.2", "", { "peerDependencies": { "solid-js": "^1.6.12" } }, "sha512-hZ/M/qr25QOCcwDPOHtGjxTD8w2mNyVAYvcfgwzBHq2RwNqHNdDNsMZYap20+ruRwW4A3Cdkczyoz0TSxLCAPQ=="],
 
+    "@t3-oss/env-core": ["@t3-oss/env-core@0.13.10", "", { "peerDependencies": { "arktype": "^2.1.0", "typescript": ">=5.0.0", "valibot": "^1.0.0-beta.7 || ^1.0.0", "zod": "^3.24.0 || ^4.0.0" }, "optionalPeers": ["arktype", "typescript", "valibot", "zod"] }, "sha512-NNFfdlJ+HmPHkLi2HKy7nwuat9SIYOxei9K10lO2YlcSObDILY7mHZNSHsieIM3A0/5OOzw/P/b+yLvPdaG52g=="],
+
     "@tailwindcss/node": ["@tailwindcss/node@4.1.18", "", { "dependencies": { "@jridgewell/remapping": "^2.3.4", "enhanced-resolve": "^5.18.3", "jiti": "^2.6.1", "lightningcss": "1.30.2", "magic-string": "^0.30.21", "source-map-js": "^1.2.1", "tailwindcss": "4.1.18" } }, "sha512-DoR7U1P7iYhw16qJ49fgXUlry1t4CpXeErJHnQ44JgTSKMaZUdf17cfn5mHchfJ4KRBZRFA/Coo+MUF5+gOaCQ=="],
 
     "@tailwindcss/oxide": ["@tailwindcss/oxide@4.1.18", "", { "optionalDependencies": { "@tailwindcss/oxide-android-arm64": "4.1.18", "@tailwindcss/oxide-darwin-arm64": "4.1.18", "@tailwindcss/oxide-darwin-x64": "4.1.18", "@tailwindcss/oxide-freebsd-x64": "4.1.18", "@tailwindcss/oxide-linux-arm-gnueabihf": "4.1.18", "@tailwindcss/oxide-linux-arm64-gnu": "4.1.18", "@tailwindcss/oxide-linux-arm64-musl": "4.1.18", "@tailwindcss/oxide-linux-x64-gnu": "4.1.18", "@tailwindcss/oxide-linux-x64-musl": "4.1.18", "@tailwindcss/oxide-wasm32-wasi": "4.1.18", "@tailwindcss/oxide-win32-arm64-msvc": "4.1.18", "@tailwindcss/oxide-win32-x64-msvc": "4.1.18" } }, "sha512-EgCR5tTS5bUSKQgzeMClT6iCY3ToqE1y+ZB0AKldj809QXk1Y+3jB0upOYZrn9aGIzPtUsP7sX4QQ4XtjBB95A=="],