beabigegg a78d878865 security: remove .env from git and update .gitignore
CRITICAL: The .env file containing real database credentials was
tracked in git. This commit:

- Removes backend/.env from git tracking (file kept locally)
- Adds .env patterns to .gitignore to prevent future commits
- Updates .env.example with placeholder values only

ACTION REQUIRED: Rotate all credentials that were exposed:
- MySQL password
- JWT secret key
- Any other secrets in the .env file

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2026-01-13 21:24:16 +08:00
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