feat: externalize buttplug as separate nginx container

- Add Dockerfile.buttplug: builds Rust/WASM + TS, serves via nginx
- Add nginx.buttplug.conf: serves /dist and /wasm with correct MIME types
- Add .gitea/workflows/docker-build-buttplug.yml: path-filtered CI workflow
- Strip Rust toolchain and buttplug build from frontend Dockerfile
- Move buttplug to devDependencies (types only at build time)
- Remove vite-plugin-wasm from frontend (WASM now served by nginx)
- Add /buttplug proxy in vite.config (dev: localhost:8080)
- Add buttplug service to compose.yml
- Load buttplug dynamically in play page via runtime import
- Fix faq page: suppress no-unnecessary-state-wrap for reassigned SvelteSet

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

compose.yml

@@ -64,6 +64,21 @@ services:
       timeout: 10s
       retries: 3
       start_period: 20s
+  buttplug:
+    build:
+      context: .
+      dockerfile: Dockerfile.buttplug
+    container_name: sexy_buttplug
+    restart: unless-stopped
+    ports:
+      - "8080:80"
+    healthcheck:
+      test:
+        ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost/dist/index.js"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
   frontend:
     build:
       context: .
@@ -78,9 +93,12 @@ services:
       HOST: 0.0.0.0
       PUBLIC_API_URL: http://sexy_backend:4000
       PUBLIC_URL: http://localhost:3000
+      BUTTPLUG_URL: http://sexy_buttplug:80
     depends_on:
       backend:
         condition: service_healthy
+      buttplug:
+        condition: service_healthy
 
 volumes:
   uploads_data: