chore: move env examples to env-example/ and unify CDN env source

- Reorganize env example files into a dedicated env-example/ directory for clarity
- Update .gitignore to ignore env files (with examples now in env-example/)
- Unify CDN credentials (CF_ZONE_ID / CF_API_TOKEN) to be sourced from .env.local in both test and production deploys
- Update git_hooks/post-receive to copy production env example from new location
- Update deploy scripts (pre_release_web.sh, release_web.sh) to copy the appropriate env example into .env.local before building
- Update _deploy_lib.sh purge_cdn_cache to source from .env.local instead of .env

env-example/.env.development.example

@@ -0,0 +1,28 @@
+# 当前环境: development
+NEXT_PUBLIC_APP_ENV=development
+
+# 后端 API 基础 URL（开发环境）
+NEXT_PUBLIC_API_BASE_URL=http://172.16.48.49:3002
+
+# WebSocket URL（开发环境，可选）
+NEXT_PUBLIC_WS_BASE_URL=ws://172.16.48.49:3002
+
+# API 超时时间（毫秒）
+NEXT_PUBLIC_API_CONNECT_TIMEOUT=30000
+NEXT_PUBLIC_API_RECEIVE_TIMEOUT=60000
+NEXT_PUBLIC_API_SEND_TIMEOUT=30000
+
+# next-auth v4（Auth.js）
+AUTH_SECRET=+0ttNDq3+OCNTrdcokOR4GZo761PiVJIGZOqUsnFOIg=
+
+# 第三方 OAuth
+AUTH_GOOGLE_ID=351948560061-isubggf6eahfii9n0stpf2qu3haralro.apps.googleusercontent.com
+AUTH_GOOGLE_SECRET=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
+AUTH_FACEBOOK_ID=26934819589512827
+AUTH_FACEBOOK_SECRET=004b1a9384b3433e153992e5edcef4ad
+
+# Cloudflare CDN（test / production 部署后刷缓存用）
+CF_ZONE_ID=b1b6bfb7795667609c8e7f418af0156b
+CF_API_TOKEN=cfut_xyHb70XCw0j8f5Wz5fg5PemUQ2ZHnSpWvmrBvVeK94d3b00f
+
+

env-example/.env.local.example

@@ -0,0 +1,19 @@
+NEXT_PUBLIC_APP_ENV=test
+NEXT_PUBLIC_API_BASE_URL=https://api.cozsweet.com
+NEXT_PUBLIC_WS_BASE_URL=wss://api.cozsweet.com
+NEXT_PUBLIC_API_CONNECT_TIMEOUT=30000
+NEXT_PUBLIC_API_RECEIVE_TIMEOUT=60000
+NEXT_PUBLIC_API_SEND_TIMEOUT=30000
+
+# next-auth v4（Auth.js）
+AUTH_SECRET=+0ttNDq3+OCNTrdcokOR4GZo761PiVJIGZOqUsnFOIg=
+
+# 第三方 OAuth
+AUTH_GOOGLE_ID=351948560061-isubggf6eahfii9n0stpf2qu3haralro.apps.googleusercontent.com
+AUTH_GOOGLE_SECRET=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
+AUTH_FACEBOOK_ID=26934819589512827
+AUTH_FACEBOOK_SECRET=004b1a9384b3433e153992e5edcef4ad
+
+# Cloudflare CDN（test / production 部署后刷缓存用）
+CF_ZONE_ID=b1b6bfb7795667609c8e7f418af0156b
+CF_API_TOKEN=cfut_xyHb70XCw0j8f5Wz5fg5PemUQ2ZHnSpWvmrBvVeK94d3b00f

env-example/.env.production.example

@@ -0,0 +1,26 @@
+# 当前环境: production
+NEXT_PUBLIC_APP_ENV=production
+
+# 后端 API 基础 URL（生产环境）
+NEXT_PUBLIC_API_BASE_URL=https://api.cozsweet.com
+
+# WebSocket URL（生产环境，可选）
+NEXT_PUBLIC_WS_BASE_URL=wss://api.cozsweet.com
+
+# API 超时时间（毫秒）
+NEXT_PUBLIC_API_CONNECT_TIMEOUT=30000
+NEXT_PUBLIC_API_RECEIVE_TIMEOUT=60000
+NEXT_PUBLIC_API_SEND_TIMEOUT=30000
+
+# next-auth v4（Auth.js）
+AUTH_SECRET=+0ttNDq3+OCNTrdcokOR4GZo761PiVJIGZOqUsnFOIg=
+
+# 第三方 OAuth
+AUTH_GOOGLE_ID=351948560061-isubggf6eahfii9n0stpf2qu3haralro.apps.googleusercontent.com
+AUTH_GOOGLE_SECRET=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
+AUTH_FACEBOOK_ID=26934819589512827
+AUTH_FACEBOOK_SECRET=004b1a9384b3433e153992e5edcef4ad
+
+# Cloudflare CDN（test / production 部署后刷缓存用）
+CF_ZONE_ID=b1b6bfb7795667609c8e7f418af0156b
+CF_API_TOKEN=cfut_xyHb70XCw0j8f5Wz5fg5PemUQ2ZHnSpWvmrBvVeK94d3b00f