chore: remove .env from git tracking and simplify .gitignore rules

- Remove .env file from git tracking (was accidentally committed)
- Simplify .gitignore to use .env* pattern instead of multiple specific patterns
- Update Dockerfile for optimized multi-stage build
- Add gen:api script placeholder to package.json

Security: Ensure sensitive environment variables are not exposed in repository

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

package.json

@@ -8,7 +8,8 @@
     "start": "next start",
     "test:api": "vitest run",
     "test:e2e": "playwright test",
-    "test": "bun run test:api && bun run test:e2e"
+    "test": "bun run test:api && bun run test:e2e",
+    "gen:api": ""
   },
   "prisma": {
     "seed": "bun run prisma/seed.ts"