Fix API Dockerfile to use requirements.txt and correct port

Fixed Dockerfile to properly install all dependencies from requirements.txt
instead of hardcoding them, and corrected the port from 8001 to 8080.

Issues Fixed:
1. ModuleNotFoundError: No module named 'httpx'
   - Dockerfile was hardcoding pip install
   - httpx was missing from hardcoded dependencies

2. Port mismatch
   - Dockerfile was exposing port 8001
   - Application uses port 8080

Changes:
- Copy requirements.txt before installing
- Use pip install -r requirements.txt
- Changed EXPOSE from 8001 to 8080
- Changed CMD port from 8001 to 8080

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

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

api/Dockerfile

@@ -2,15 +2,18 @@ FROM python:3.11-slim
 
 WORKDIR /app
 
-# Install dependencies
-RUN pip install --no-cache-dir fastapi uvicorn[standard] pydantic
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Install dependencies from requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application
 COPY db.json .
 COPY main.py .
 
 # Expose port
-EXPOSE 8001
+EXPOSE 8080
 
 # Run the application
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8001"]
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8080"]