feat: full project sync - CI fixes, frontend, workspace API, and all changes

frontend/README.md

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+# Excalidraw FULL Frontend
+
+Production-grade frontend for the Excalidraw FULL overhaul.
+
+## Stack
+
+- React 19 + TypeScript
+- Vite (fast HMR, optimized builds)
+- SCSS Modules (scoped styles)
+- Zustand (state management)
+- React Router (routing)
+- Lucide React (icons)
+
+## Design System
+
+Excalidraw's hand-drawn aesthetic preserved:
+- **Island UI**: Floating panels with subtle shadows
+- **Primary**: Purple (`#6965db`)
+- **Typography**: Inter font, clear hierarchy
+- **Shadows**: Multi-layer island shadows
+- **Radii**: Consistent 6-12px rounding
+
+## Pages
+
+| Route | Page | Features |
+|-------|------|----------|
+| `/` | Dashboard | Stats, recent drawings, activity, templates |
+| `/login` | Login | Email/password + GitHub OAuth |
+| `/signup` | Signup | Account creation |
+| `/files` | File Browser | Folder tree, grid/list view, drawing cards |
+| `/team` | Team Settings | Members, roles, invites |
+| `/settings` | User Settings | Profile, account, notifications, appearance |
+| `/templates` | Templates | Gallery with categories |
+| `/drawing/:id` | Editor | Canvas placeholder (integrate Excalidraw) |
+
+## Quick Start
+
+```bash
+npm install
+npm run dev        # Development server at http://localhost:3000
+npm run typecheck  # Type checking
+npm run build      # Production build
+```
+
+## API Integration
+
+Update `src/services/api.ts` endpoints to match your Go backend:
+- `GET /api/auth/me` - Current user
+- `POST /api/auth/login` - Login
+- `GET /api/drawings` - List drawings
+- `GET /api/teams` - List teams
+
+The Vite proxy forwards `/api` to `http://localhost:3002`.
+
+## Canvas Integration
+
+To integrate the existing Excalidraw canvas:
+
+1. Install package: `npm install @excalidraw/excalidraw`
+2. Import in `Editor.tsx`: `import { Excalidraw } from '@excalidraw/excalidraw'`
+3. Replace the placeholder div with the `<Excalidraw />` component
+4. Wire up `onChange` to save via API
+
+## Project Structure
+
+```
+src/
+├── components/    # Reusable UI (Button, Input, Card, Layout)
+├── pages/         # Route components
+├── stores/        # Zustand state
+├── services/      # API clients
+├── types/         # TypeScript interfaces
+└── styles/        # SCSS variables, global styles
+```