Implement best practices and comprehensive documentation

[Copilot]

Establishes production-ready patterns and documentation infrastructure for the codebase per the request to "impl it best practice best coupled with readme."

Backend

• Health endpoint: /api/health returns status, version, timestamp
• Configurable CORS: Environment-driven via CORS_ALLOWED_ORIGIN (defaults to localhost:5173)
• Structured logging: Tracing with environment-based levels
• Config standards: rustfmt, clippy rules, .env.example

// Before: hardcoded CORS
Cors::new().allow_origin("http://localhost:5173")

// After: environment-configurable
let origin = std::env::var("CORS_ALLOWED_ORIGIN")
    .unwrap_or_else(|_| "http://localhost:5173".to_string());
Cors::new().allow_origin(&origin)

Frontend

• ErrorBoundary: React error handling with fallback UI
• Type safety: Local interface definitions replacing generated types for simpler builds
• Config standards: Prettier, .env.example

Documentation

• README: Architecture, setup, API docs, development workflow, troubleshooting
• CONTRIBUTING: Git workflow, code standards (Rust + TypeScript), commit conventions
• ARCHITECTURE: System design, data flows, tech stack, future roadmap
• CODE_OF_CONDUCT: Contributor Covenant
• CHANGELOG: Structured change tracking
• LICENSE: MIT

All code passes linters (clippy, eslint) and builds successfully.

Original prompt

impl it
best practice
best coupled with readme!

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💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[nkanf-dev]

use agplv3

[nkanf-dev]

不要写多余的注释，保持代码整洁