feat: add Docker support, refactor DB layer, update API responses

Dockerfile

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+FROM dart:3.10.1 AS builder
+
+WORKDIR /app
+
+# Copy only pubspec files first for better caching
+COPY pubspec.yaml pubspec.lock ./
+
+# Install dependencies
+RUN dart pub get
+
+# Copy all source files
+COPY . .
+
+# Build the Dart application
+RUN dart pub get && dart compile exe bin/server.dart -o bin/server.exe
+
+# Production stage
+FROM debian:bookworm-slim AS production
+
+RUN apt-get update && apt-get install -y \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy the compiled executable from builder
+COPY --from=builder /app/bin/server.exe ./bin/server.exe
+
+# Set environment variables
+ENV PORT=9090
+ENV POSTGRES_HOST=localhost
+ENV POSTGRES_PORT=5432
+ENV POSTGRES_DB=family_safety
+ENV POSTGRES_USER=postgres
+ENV POSTGRES_PASSWORD=postgres
+ENV JWT_SECRET=your-super-secret-key-change-me
+ENV TOKEN_LIFETIME=600
+
+EXPOSE 9090
+
+CMD ["./bin/server.exe"]