feat: add Copilot instructions for Ionian project, detailing architecture, workflows, and conventions

.github/copilot-instructions.md

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+# Copilot Instructions for Ionian
+
+## Project Overview
+Ionian is a full-stack content file management system focused on comic/media files. It's a pnpm monorepo with 3 packages: `server` (Elysia.js API), `client` (React+Vite SPA), and `dbtype` (shared TypeScript types).
+
+## Architecture & Key Patterns
+
+### Monorepo Structure
+- Uses pnpm workspaces with `packages/*` configuration
+- `dbtype` package provides shared types between client/server
+- Server builds to `dist/` directory which client proxies to via Vite dev server
+
+### Server Architecture (Elysia.js + SQLite)
+- **Framework**: Elysia.js with TypeScript, uses Kysely for type-safe SQL queries
+- **Database**: SQLite with custom migration system in `migrations/` directory
+- **Core Pattern**: Document-centric with content types (`comic`, `video`, etc.)
+- **File Watching**: `DiffManager` + content watchers monitor filesystem changes in `src/diff/`
+- **Permissions**: Role-based system in `src/permission/permission.ts`
+- **Routes**: Organized by domain (`/api/doc/*`, `/api/user/*`, `/api/diff/*`)
+
+### Client Architecture (React + State Management)
+- **Router**: Uses `wouter` (not React Router) for client-side routing
+- **State**: Jotai atoms for global state (`src/lib/atom.ts` re-exports jotai)
+- **API**: SWR for data fetching with custom hooks in `src/hook/`
+- **UI**: shadcn/ui components with Tailwind CSS, dark mode support
+- **Build Info**: Vite injects git hash/build time via `__BUILD_*__` constants
+
+### Critical File Watching System
+The diff system monitors content directories:
+- `DiffManager` orchestrates multiple content watchers
+- `ContentDiffHandler` processes filesystem changes
+- Watchers register via `await diffManager.register(type, watcher)`
+- Content changes queue in waiting lists before manual commit
+
+## Development Workflows
+
+### Build Commands
+```bash
+# Full deployment build (run from root)
+pnpm run app:build        # Builds both client and server
+
+# Individual package builds
+pnpm run compile          # Server build
+pnpm run build           # Client build (from packages/client)
+
+# Development
+cd packages/server && pnpm run dev    # tsx watch mode
+cd packages/client && pnpm run dev    # Vite dev server
+```
+
+### Database Migrations
+```bash
+cd packages/server && pnpm run migrate
+```
+Migrations live in `migrations/YYYY-MM-DD.ts` with manual version tracking.
+
+### Testing
+```bash
+cd packages/server && pnpm test        # Vitest unit tests
+cd packages/server && pnpm test:watch  # Watch mode
+```
+
+## Key Conventions
+
+### Import Patterns
+- Server: Use `.ts` extensions in imports (`./module.ts`)
+- Client: Use `@/` alias for `src/` directory
+- Cross-package imports: `import { Type } from "dbtype/mod.ts"`
+
+### API Design
+- RESTful routes under `/api/` prefix
+- Elysia schema validation with `t.Object()` patterns
+- Permission decorators: `beforeHandle: createPermissionCheck(Permission.QueryContent)`
+- Error handling via `sendError()` helper and global error handler
+
+### Component Patterns
+- Page components in `src/page/` directory
+- Reusable components in `src/components/` with ui/ subdirectory
+- Custom hooks in `src/hook/` for API operations
+- State atoms in `src/lib/atom.ts`
+
+### Database Patterns
+- Models in `src/model/` define interfaces
+- Controllers in `src/db/` implement database operations
+- Use Kysely query builder, not raw SQL
+- Document-centric design with tag relationships
+
+## Project-Specific Context
+
+### Content Types
+System supports multiple content types (`comic`, `video`) with extensible architecture. Comic content has special thumbnail/page rendering support.
+
+### Permission System
+Three-tier permissions: Admin, User, Guest. Check `src/permission/permission.ts` for available permissions.
+
+### Client-Server Communication
+- Client proxies `/api/*` to server during development
+- Production serves client from server's static middleware
+- Authentication via HTTP-only cookies with JWT refresh pattern
+
+## Common Tasks
+
+### Adding New Content Type
+1. Create watcher in `src/diff/watcher/`
+2. Register in `create_server()` 
+3. Add route handler in `src/route/`
+4. Update `dbtype` if new fields needed
+
+### Adding New API Endpoint
+1. Create route in appropriate `src/route/*.ts` file
+2. Add to main router in `src/server.ts`
+3. Define types in `dbtype` package if needed
+4. Create client hook in `packages/client/src/hook/`
+
+### UI Component Development
+1. Use shadcn/ui patterns in `src/components/ui/`
+2. Use Jotai atoms for component state sharing
+3. Follow existing page structure patterns