refactor(docker): move Dockerfile to root for simpler Dokploy setup

apps/backend/Dockerfile

@@ -1,70 +0,0 @@
-# syntax=docker/dockerfile:1.7
-
-# Stage 1: Install backend dependencies (cached unless backend deps change)
-FROM oven/bun:1.3 AS backend-deps
-WORKDIR /app
-COPY package.json ./
-COPY apps/backend/package.json apps/backend/
-COPY packages/api-contract packages/api-contract/
-RUN bun install --frozen-lockfile
-
-# Stage 2: Install frontend dependencies (cached unless frontend deps change)
-FROM oven/bun:1.3 AS frontend-deps
-WORKDIR /app
-COPY package.json ./
-COPY apps/frontend/package.json apps/frontend/
-COPY packages/api-contract packages/api-contract/
-RUN bun install --frozen-lockfile
-
-# Stage 3: Build stage
-FROM backend-deps AS build
-WORKDIR /app
-
-# Copy frontend deps for building
-COPY --from=frontend-deps /app/node_modules ./frontend_node_modules
-
-# Copy source code
-COPY apps/backend apps/backend
-COPY apps/frontend apps/frontend
-COPY packages/api-contract packages/api-contract
-
-# Build-time variables for Vite.
-ARG VITE_API_BASE_URL
-ARG VITE_SUPABASE_URL
-ARG VITE_SUPABASE_ANON_KEY
-ENV VITE_API_BASE_URL=${VITE_API_BASE_URL}
-ENV VITE_SUPABASE_URL=${VITE_SUPABASE_URL}
-ENV VITE_SUPABASE_ANON_KEY=${VITE_SUPABASE_ANON_KEY}
-
-# Prisma 7 config resolves DATABASE_URL at generate time.
-ARG DATABASE_URL=postgresql://postgres:postgres@localhost:5432/postgres
-ENV DATABASE_URL=${DATABASE_URL}
-
-# Build frontend with its own node_modules
-RUN cp -R frontend_node_modules apps/frontend/node_modules
-RUN bun --cwd apps/frontend run build
-
-# Copy frontend build output to backend public folder
-RUN mkdir -p apps/backend/public && cp -R apps/frontend/dist/. apps/backend/public/
-
-# Generate Prisma client
-RUN bun --cwd apps/backend run prisma:generate
-
-# Stage 4: Runner
-FROM oven/bun:1.3-slim AS runner
-WORKDIR /app
-
-ENV NODE_ENV=production
-ENV HOST=0.0.0.0
-ENV PORT=3000
-
-# Copy only backend deps and built artifacts
-COPY --from=backend-deps /app/node_modules ./node_modules
-COPY --from=build /app/apps/backend ./apps/backend
-COPY --from=build /app/packages ./packages
-COPY package.json ./
-
-WORKDIR /app/apps/backend
-EXPOSE 3000
-
-CMD ["sh", "-lc", "bun run prisma:migrate:deploy && bun run start"]