feat: Phase 3 — Workshop (community patch sharing)

Server:
- GET /api/v1/workshop — browse patches (search, tags, sort)
- POST /api/v1/workshop — share a patch (auth required)
- GET /api/v1/workshop/:id — single patch detail
- DELETE /api/v1/workshop/:id — soft delete (owner/admin)
- POST/DELETE /api/v1/workshop/:id/like — like/unlike
- POST /api/v1/workshop/:id/report — flag for moderation

Client:
- Workshop page with nav bar (Sandbox/SynthQuest/Workshop tabs)
- Search bar + tag filters (ambient, bass, drums, etc.)
- Sort by recent/popular
- Patch cards: title, author, tags, likes, module count
- "Cargar" button loads patch into Sandbox
- Share modal: title, description, tags, shares current canvas
- User badge + login button in Workshop nav
- Responsive: single column on mobile

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/client/src/services/api.js

@@ -73,6 +73,17 @@ export const users = {
   update: (data) => request('PATCH', '/users/me', data),
 };
 
+// Workshop
+export const workshop = {
+  browse: (params = '') => request('GET', `/workshop${params ? '?' + params : ''}`),
+  get: (id) => request('GET', `/workshop/${id}`),
+  share: (data) => request('POST', '/workshop', data),
+  remove: (id) => request('DELETE', `/workshop/${id}`),
+  like: (id) => request('POST', `/workshop/${id}/like`),
+  unlike: (id) => request('DELETE', `/workshop/${id}/like`),
+  report: (id) => request('POST', `/workshop/${id}/report`),
+};
+
 // Admin
 export const admin = {
   stats: () => request('GET', '/admin/stats'),