migrate: replace pg with Prisma ORM

- Add prisma/schema.prisma with Project/Task models, enums, and relations
- Create src/lib/db.ts singleton Prisma client
- Refactor all 5 API routes to use Prisma queries
- Replace migrate.ts with seed.ts for initial data
- Update Dockerfile for Prisma lifecycle (copy generated client)
- Update tsconfig.json with @/generated/* path alias
- Remove pg and @types/pg dependencies
- Add prisma.config.ts for Prisma 6 config
- Update .gitignore for generated Prisma client

Dockerfile

@@ -12,6 +12,9 @@ RUN npm ci
 # Copy source code
 COPY . .
 
+# Generate Prisma client
+RUN npx prisma generate
+
 # Build the Next.js app
 RUN npm run build
 
@@ -24,9 +27,8 @@ ENV NODE_ENV=production
 ENV HOSTNAME="0.0.0.0"
 ENV PORT=3000
 
-# Install postgres client, netcat, and tsx for migrations
-RUN apk add --no-cache postgresql-client netcat-openbsd && \
-    npm install -g tsx
+# Install postgres client and netcat
+RUN apk add --no-cache postgresql-client netcat-openbsd
 
 # Create a non-root user
 RUN addgroup --system --gid 1001 nodejs && \
@@ -34,14 +36,14 @@ RUN addgroup --system --gid 1001 nodejs && \
 
 # Copy the built app from builder
 COPY --from=builder /app/public ./public
-COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone/ ./
-COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=builder --chown=nextjs:nodejs /app/.next ./.next
 COPY --from=builder /app/package.json ./
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/prisma ./prisma
+# Copy generated Prisma client (includes native query engine binary)
+COPY --from=builder /app/src/generated ./src/generated
 
-# Copy migration script (for initial setup)
-COPY --chown=nextjs:nodejs src/server/db/migrate.ts ./migrate.ts
-
-# Create startup script
+# Copy startup script
 COPY start.sh /app/start.sh
 RUN chmod +x /app/start.sh
 
@@ -49,4 +51,4 @@ USER nextjs
 
 EXPOSE 3000
 
-CMD ["/app/start.sh"]
+CMD ["/app/start.sh"]