Simplify Dockerfile to use pre-built musl binary, add Ingress

- Dockerfile: drop Rust build stage, COPY static musl binary directly
- Add traefik Ingress for tori.oci.euphon.net with LE cert

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

Dockerfile

@@ -6,19 +6,11 @@ RUN npm ci
 COPY web/ ./
 RUN npm run build
 
-# Stage 2: Build backend
-FROM rust:1.86-alpine AS backend
-RUN apk add --no-cache musl-dev
-WORKDIR /app
-COPY Cargo.toml Cargo.lock ./
-COPY src/ ./src/
-RUN cargo build --release
-
-# Stage 3: Runtime
+# Stage 2: Runtime
 FROM alpine:3.21
 RUN apk add --no-cache ca-certificates
 WORKDIR /app
-COPY --from=backend /app/target/release/tori .
+COPY target/aarch64-unknown-linux-musl/release/tori .
 COPY --from=frontend /app/web/dist ./web/dist/
 COPY config.yaml .