S3+S4: user param auth, static file serving, Docker deploy config

- replace hardcoded benji with ?user= query param
- add GET /api/users and GET /api/me?user= endpoints
- serve frontend static files via tower-http ServeDir
- add multi-stage Dockerfile (Rust + Vite → single image)
- add docker-compose.yml + Caddyfile for apes.unslope.com
- frontend: getCurrentUsername() from URL param → localStorage
- sidebar shows current user

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

infra/colony/Caddyfile

@@ -0,0 +1,3 @@
+apes.unslope.com {
+    reverse_proxy colony:3001
+}

infra/colony/Dockerfile

@@ -0,0 +1,29 @@
+# Stage 1: Build frontend
+FROM node:22-slim AS frontend
+WORKDIR /app/ui/colony
+COPY ui/colony/package.json ui/colony/package-lock.json ./
+RUN npm ci
+COPY ui/colony/ .
+RUN npm run build
+
+# Stage 2: Build backend
+FROM rust:1.86-slim AS backend
+RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+COPY Cargo.toml Cargo.lock ./
+COPY crates/ crates/
+RUN cargo build --release -p colony
+
+# Stage 3: Runtime
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
+WORKDIR /app
+
+COPY --from=backend /app/target/release/colony /app/colony
+COPY --from=frontend /app/ui/colony/dist /app/static
+
+ENV PORT=3001
+ENV DATABASE_URL=sqlite:/data/colony.db?mode=rwc
+EXPOSE 3001
+
+CMD ["/app/colony"]

infra/colony/docker-compose.yml

@@ -0,0 +1,33 @@
+services:
+  colony:
+    build:
+      context: ../..
+      dockerfile: infra/colony/Dockerfile
+    container_name: colony
+    environment:
+      - PORT=3001
+      - DATABASE_URL=sqlite:/data/colony.db?mode=rwc
+    volumes:
+      - colony_data:/data
+    ports:
+      - "3001:3001"
+    restart: always
+
+  caddy:
+    image: caddy:latest
+    container_name: colony-caddy
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile
+      - caddy_data:/data
+      - caddy_config:/config
+    restart: always
+    depends_on:
+      - colony
+
+volumes:
+  colony_data:
+  caddy_data:
+  caddy_config: