feat: add Dockerfiles and MySQL TypeORM wiring for center/guild backends

Fabric.Backend.Guild/Dockerfile

@@ -0,0 +1,19 @@
+FROM node:22-alpine AS deps
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN npm run build
+
+FROM node:22-alpine AS runtime
+WORKDIR /app
+ENV NODE_ENV=production
+COPY package*.json ./
+RUN npm ci --omit=dev
+COPY --from=build /app/dist ./dist
+EXPOSE 7002
+CMD ["node", "dist/main.js"]