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>

Dockerfile.buttplug

@@ -0,0 +1,65 @@
+# syntax=docker/dockerfile:1
+
+# ============================================================================
+# Builder stage - compile Rust/WASM and TypeScript
+# ============================================================================
+FROM node:22.11.0-slim AS builder
+
+# Install build dependencies for Rust
+RUN apt-get update && apt-get install -y \
+    curl \
+    build-essential \
+    pkg-config \
+    libssl-dev \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Enable corepack for pnpm
+RUN npm install -g corepack@latest && corepack enable
+
+# Install Rust toolchain
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    --default-toolchain stable \
+    --profile minimal \
+    --target wasm32-unknown-unknown
+
+ENV PATH="/root/.cargo/bin:${PATH}"
+
+# Install wasm-bindgen-cli
+RUN cargo install wasm-bindgen-cli
+
+WORKDIR /app
+
+# Copy workspace configuration
+COPY pnpm-workspace.yaml package.json pnpm-lock.yaml ./
+COPY packages/buttplug ./packages/buttplug
+
+# Install dependencies
+RUN pnpm install --frozen-lockfile --filter @sexy.pivoine.art/buttplug
+
+# Build WASM
+RUN RUSTFLAGS='--cfg getrandom_backend="wasm_js" --cfg=web_sys_unstable_apis' \
+    pnpm --filter @sexy.pivoine.art/buttplug build:wasm
+
+# Build TypeScript
+RUN pnpm --filter @sexy.pivoine.art/buttplug build
+
+# ============================================================================
+# Runner stage - nginx serving dist/ and wasm/
+# ============================================================================
+FROM nginx:1.27-alpine AS runner
+
+# Remove default nginx config
+RUN rm /etc/nginx/conf.d/default.conf
+
+# Copy nginx config
+COPY nginx.buttplug.conf /etc/nginx/conf.d/buttplug.conf
+
+# Copy built artifacts
+COPY --from=builder /app/packages/buttplug/dist /usr/share/nginx/html/dist
+COPY --from=builder /app/packages/buttplug/wasm /usr/share/nginx/html/wasm
+
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=3s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost/dist/index.js || exit 1