build: add Docker Compose setup for Dokploy deployment

- Multi-stage Dockerfile for Go backend (golang:1.25-alpine -> alpine:3)
- Multi-stage Dockerfile for Next.js frontend (bun:1 -> node:22-alpine)
- docker-compose.yml with backend + frontend services, health checks
- Next.js standalone output + API rewrites to proxy /api/* to backend
- .dockerignore files for both services
- .env.example documenting required environment variables

.env.example

@@ -0,0 +1,12 @@
+# KanzlAI Environment Variables
+# Copy to .env and fill in values: cp .env.example .env
+
+# Backend
+PORT=8080
+
+# Supabase (required for database access)
+SUPABASE_URL=
+SUPABASE_ANON_KEY=
+
+# Claude API (required for AI features)
+ANTHROPIC_API_KEY=

backend/.dockerignore

@@ -0,0 +1,6 @@
+bin/
+*.exe
+.git
+.gitignore
+Dockerfile
+.dockerignore

backend/Dockerfile

@@ -0,0 +1,15 @@
+# Build
+FROM golang:1.25-alpine AS builder
+WORKDIR /app
+COPY go.mod ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o server ./cmd/server
+
+# Run
+FROM alpine:3
+RUN apk --no-cache add ca-certificates
+WORKDIR /app
+COPY --from=builder /app/server .
+EXPOSE 8080
+CMD ["./server"]

docker-compose.yml

@@ -0,0 +1,33 @@
+services:
+  backend:
+    build:
+      context: ./backend
+    expose:
+      - "8080"
+    env_file:
+      - .env
+    environment:
+      - PORT=8080
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 5s
+
+  frontend:
+    build:
+      context: ./frontend
+    ports:
+      - "3000:3000"
+    depends_on:
+      backend:
+        condition: service_healthy
+    env_file:
+      - .env
+    healthcheck:
+      test: ["CMD", "wget", "--spider", "-q", "http://localhost:3000"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s

frontend/.dockerignore

@@ -0,0 +1,9 @@
+node_modules/
+.next/
+out/
+build/
+.git
+.gitignore
+Dockerfile
+.dockerignore
+.env*

frontend/Dockerfile

@@ -0,0 +1,28 @@
+# Dependencies
+FROM oven/bun:1 AS deps
+WORKDIR /app
+COPY package.json bun.lock ./
+RUN bun install --frozen-lockfile
+
+# Build
+FROM oven/bun:1 AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+ENV API_URL=http://backend:8080
+RUN mkdir -p public
+RUN bun run build
+
+# Run
+FROM node:22-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+ENV HOSTNAME=0.0.0.0
+ENV PORT=3000
+
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+EXPOSE 3000
+CMD ["node", "server.js"]

frontend/next.config.ts

@@ -1,7 +1,13 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  /* config options here */
+  output: "standalone",
+  rewrites: async () => [
+    {
+      source: "/api/:path*",
+      destination: `${process.env.API_URL || "http://localhost:8080"}/:path*`,
+    },
+  ],
 };
 
 export default nextConfig;