chore(repo): ignore local environment files

[Flow-Fly]

Summary

• ignore local .env files and local variants at the repository root and within workspaces
• keep .env.example and .env.template naming forms trackable
• audit tracked environment files and verify ignore behavior directly with Git

Linked task issues

• Repository hygiene — ignore local environment files #388

Verification

• protected root/workspace .env cases checked with git check-ignore
• retained example/template and CI cases checked with git check-ignore
• tracked environment-file audit (only server/.env.example)
• npx tsc --noEmit
• npm run lint (0 errors; 5 inherited warnings)
• npm run test:run (116 files, 742 tests)
• npm run build
• npm run fallow:audit -- --base origin/develop
• git diff --check
• residue, secrets, dependency-lock, and large-file readiness sweeps
• complete diff simplification review (no change warranted)
• GitHub CI (checks, server-container, CodeRabbit)

Limitations

• No new automated test was added because the repository has no existing Git-ignore/residue test pattern; direct Git behavior is the focused regression evidence.
• The repo-wide npm run format:check reports the inherited baseline of 240 unrelated files; .gitignore has no Prettier parser and this slice does not change formatted source files.

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