Add PDF reports, file uploads, admin auth, and comprehensive tests

Features:
- PDF service for generating task reports with ReportLab-style formatting
- Storage service for file uploads (local and S3-compatible)
- Admin authentication middleware with JWT support
- Admin user model and repository

Infrastructure:
- Updated Docker configuration for admin panel builds
- Email service enhancements for task notifications
- Updated router with admin and file upload routes
- Environment configuration updates

Tests:
- Unit tests for handlers (auth, residence, task)
- Unit tests for models (user, residence, task)
- Unit tests for repositories (user, residence, task)
- Unit tests for services (residence, task)
- Integration test setup
- Test utilities for mocking database and services

Database:
- Admin user seed data
- Updated test data seeds

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Dockerfile

@@ -1,4 +1,21 @@
-# Build stage
+# Admin panel build stage
+FROM node:20-alpine AS admin-builder
+
+WORKDIR /app
+
+# Copy admin panel files
+COPY admin/package*.json ./
+
+# Install dependencies
+RUN npm ci
+
+# Copy source
+COPY admin/ .
+
+# Build (standalone mode)
+RUN npm run build
+
+# Go build stage
 FROM golang:1.23-alpine AS builder
 
 # Install build dependencies
@@ -22,11 +39,8 @@ RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /app/api
 # Build the worker binary
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /app/worker ./cmd/worker
 
-# Build the admin binary
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /app/admin ./cmd/admin
-
-# Final stage - Production API (default target for Dokku)
-FROM alpine:3.19
+# Base runtime stage for Go services
+FROM alpine:3.19 AS go-base
 
 # Install runtime dependencies
 RUN apk add --no-cache ca-certificates tzdata curl
@@ -40,7 +54,6 @@ WORKDIR /app
 # Copy all binaries from builder
 COPY --from=builder /app/api /app/api
 COPY --from=builder /app/worker /app/worker
-COPY --from=builder /app/admin /app/admin
 
 # Copy templates directory
 COPY --from=builder /app/templates /app/templates
@@ -55,12 +68,42 @@ RUN mkdir -p /app/uploads && chown -R app:app /app
 # Switch to non-root user
 USER app
 
-# Expose port (Dokku will set PORT env var to 5000)
-EXPOSE 5000
+# API stage
+FROM go-base AS api
+EXPOSE 8000
+HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
+    CMD curl -f http://localhost:${PORT:-8000}/api/health/ || exit 1
+CMD ["/app/api"]
 
-# Health check using curl (more reliable)
+# Worker stage
+FROM go-base AS worker
+CMD ["/app/worker"]
+
+# Admin panel runtime stage
+FROM node:20-alpine AS admin
+
+WORKDIR /app
+
+# Create non-root user
+RUN addgroup -g 1001 nodejs && adduser -u 1001 -G nodejs -s /bin/sh -D nextjs
+
+# Copy standalone build
+COPY --from=admin-builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=admin-builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+COPY --from=admin-builder --chown=nextjs:nodejs /app/public ./public
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]
+
+# Default production stage (for Dokku - runs API)
+FROM go-base AS production
+EXPOSE 5000
 HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
     CMD curl -f http://localhost:${PORT:-5000}/api/health/ || exit 1
-
-# Run the API (default command)
 CMD ["/app/api"]