Add Dockerfiles and Gitea CI workflow

.gitea/workflows/build.yaml

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+name: Build and Deploy Chitfund
+on: [push]
+
+jobs:
+  build-backend:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Build and push Backend
+        uses: docker/build-push-action@v4
+        with:
+          context: ./backend
+          push: true
+          tags: 192.168.8.250:5000/chitfund-backend:latest
+          # Local registry is insecure
+          labels: |
+            org.opencontainers.image.source=${{ gitea.repository_url }}
+
+  build-frontend:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Build and push Frontend
+        uses: docker/build-push-action@v4
+        with:
+          context: ./luckychit
+          push: true
+          tags: 192.168.8.250:5000/chitfund-frontend:latest

backend/Dockerfile

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+# Backend Dockerfile for Chitfund
+FROM node:20-slim
+
+WORKDIR /app
+
+# Install build essentials for bcrypt if needed (though pre-built binaries usually work on slim)
+RUN apt-get update && apt-get install -y python3 make g++ && rm -rf /var/lib/apt/lists/*
+
+COPY package*.json ./
+RUN npm install --omit=dev
+
+COPY . .
+
+EXPOSE 3000
+
+CMD ["npm", "start"]

luckychit/Dockerfile

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+# Frontend Dockerfile for Chitfund (Flutter Web)
+FROM node:20-slim
+
+WORKDIR /app
+
+# We serve the build/web directory. 
+# NOTE: This Dockerfile assumes you have already run 'flutter build web' 
+# or we will use a multi-stage build if you prefer.
+# For simplicity in this home lab, we copy the build output.
+
+COPY package*.json ./
+RUN npm install express
+
+COPY . .
+
+EXPOSE 8080
+
+CMD ["node", "web-server.js"]