feat: migrate backend from rust to go

This commit replaces the Axum/Rust backend with a Gin/Go implementation. The original Rust code has been archived in the 'rust' branch.

Dockerfile

@@ -1,35 +1,34 @@
-# ── Build stage ──────────────────────────────────────────────
-FROM rust:1-bookworm AS builder
+# Build stage
+FROM golang:1.22-alpine AS builder
 
 WORKDIR /app
 
-# Cache dependency build
-COPY Cargo.toml Cargo.lock ./
-RUN mkdir src && echo 'fn main() {}' > src/main.rs && \
-    cargo build --release && \
-    rm -rf src
+# Copy go mod and sum files
+COPY go.mod go.sum ./
+RUN go mod download
 
-# Build the actual binary
-COPY src/ src/
-RUN touch src/main.rs && cargo build --release
+# Copy the source code
+COPY . .
 
-# ── Runtime stage ────────────────────────────────────────────
-FROM debian:bookworm-slim
+# Build the application
+RUN CGO_ENABLED=0 GOOS=linux go build -o llm-proxy ./cmd/llm-proxy
 
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends ca-certificates && \
-    rm -rf /var/lib/apt/lists/*
+# Final stage
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates tzdata
 
 WORKDIR /app
 
-COPY --from=builder /app/target/release/llm-proxy /app/llm-proxy
-COPY static/ /app/static/
+# Copy the binary from the builder stage
+COPY --from=builder /app/llm-proxy .
+COPY --from=builder /app/static ./static
 
-# Default config location
-VOLUME ["/app/config", "/app/data"]
+# Create data directory
+RUN mkdir -p /app/data
 
+# Expose port
 EXPOSE 8080
 
-ENV RUST_LOG=info
-
-ENTRYPOINT ["/app/llm-proxy"]
+# Run the application
+CMD ["./llm-proxy"]