docs: Add deployment and project documentation with unified env config

- Add DEPLOYMENT.md for 1Panel deployment guide with troubleshooting
- Add README.md with project architecture and quick start guide
- Update .gitignore to exclude development docs (openspec/, CLAUDE.md, etc.)
- Unify port configuration via .env (BACKEND_PORT, FRONTEND_PORT, MINIO_API_PORT, MINIO_CONSOLE_PORT)
- Update start-dev.sh and check-env.sh to read ports from .env

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -8,12 +8,19 @@ venv/
 env/
 ENV/
 
+# Python cache
+.cache/
+.ruff_cache/
+.mypy_cache/
+
 # Database
 *.db
 *.db-journal
 
 # Environment
 .env
+.env.local
+.env.docker
 
 # IDE
 .vscode/
@@ -25,6 +32,7 @@ ENV/
 .pytest_cache/
 .coverage
 htmlcov/
+tests/__pycache__/
 
 # Project specific
 task_reporter.db
@@ -34,7 +42,16 @@ server.log
 node_modules/
 frontend/dist/
 frontend/.vite/
+frontend/.cache/
+.eslintcache
 
 # Development scripts
 .pids/
 logs/
+
+# Development documentation (AI/OpenSpec)
+openspec/
+AGENTS.md
+CLAUDE.md
+PROGRESS.md
+.claude/