fix: resolve module import error for MCP services

Run MCP service manager from /app instead of /app/agent_tools
to ensure services can import from tools module.

Changes:
- entrypoint.sh: Run start_mcp_services.py from /app directory
- start_mcp_services.py: Use absolute paths for service scripts
- start_mcp_services.py: Set working directory to /app for services

Fixes ModuleNotFoundError: No module named 'tools' in price.log

entrypoint.sh

@@ -47,10 +47,9 @@ cd /app
 
 # Step 2: Start MCP services in background
 echo "🔧 Starting MCP services..."
-cd /app/agent_tools
-python start_mcp_services.py &
-MCP_PID=$!
 cd /app
+python agent_tools/start_mcp_services.py &
+MCP_PID=$!
 
 # Step 3: Wait for services to initialize
 echo "⏳ Waiting for MCP services to start..."