feat: Complete Application Infrastructure and Security Overhaul (#28)

Chores & Configuration
	•	Enhanced development setup: optimized Dockerfile, refined scripts, and improved .gitignore.
	•	Updated docker-compose for better dev/prod separation.
	•	Improved documentation in README and source files.

Features & Enhancements
	•	Refactored project structure with modular architecture.
	•	Improved testing infrastructure and integration tests.
	•	Enhanced file upload logic, client-side handling, and API routes.
	•	Implemented robust server shutdown, rate limiting, and cleanup mechanisms.
	•	Improved upload progress tracking with UI enhancements.
	•	Strengthened security in PIN authentication and cookie handling.

Refactors & Fixes
	•	Cleaned up test infrastructure, logging, and error handling.
	•	Simplified API route paths and improved middleware.
	•	Fixed incorrect total storage size reporting.
	•	Optimized logging verbosity based on environment.

Documentation
	•	Expanded project documentation and comments for clarity.

Dockerfile

@@ -1,26 +1,64 @@
-FROM node:18-alpine
+# Base stage for shared configurations
+FROM node:20-alpine as base
 
-# Install python and create virtual environment
+# Install python and create virtual environment with minimal dependencies
 RUN apk add --no-cache python3 py3-pip && \
-    python3 -m venv /opt/venv
+    python3 -m venv /opt/venv && \
+    rm -rf /var/cache/apk/*
 
 # Activate virtual environment and install apprise
 RUN . /opt/venv/bin/activate && \
-    pip install --no-cache-dir apprise
+    pip install --no-cache-dir apprise && \
+    find /opt/venv -type d -name "__pycache__" -exec rm -r {} +
 
 # Add virtual environment to PATH
 ENV PATH="/opt/venv/bin:$PATH"
 
-WORKDIR /app
+WORKDIR /usr/src/app
+
+# Dependencies stage
+FROM base as deps
 
 COPY package*.json ./
+RUN npm ci --only=production && \
+    # Remove npm cache
+    npm cache clean --force
 
-RUN npm install
+# Development stage
+FROM deps as development
+ENV NODE_ENV=development
 
-COPY . .
+# Install dev dependencies
+RUN npm install && \
+    npm cache clean --force
 
-RUN mkdir -p uploads
+# Create upload directories
+RUN mkdir -p uploads local_uploads
 
+# Copy source with specific paths to avoid unnecessary files
+COPY src/ ./src/
+COPY public/ ./public/
+COPY __tests__/ ./__tests__/
+COPY dev/ ./dev/
+COPY .eslintrc.json .eslintignore ./
+
+# Expose port
 EXPOSE 3000
 
-CMD ["node", "server.js"]
+CMD ["npm", "run", "dev"]
+
+# Production stage
+FROM deps as production
+ENV NODE_ENV=production
+
+# Create upload directory
+RUN mkdir -p uploads
+
+# Copy only necessary source files
+COPY src/ ./src/
+COPY public/ ./public/
+
+# Expose port
+EXPOSE 3000
+
+CMD ["npm", "start"]