Fix log_level in fastmcp.json not being applied to global settings

The log_level configured in fastmcp.json deployment section was parsed
but never applied to the global fastmcp.settings.log_level, causing
the server to use the default INFO level instead of the configured level.

This fix updates apply_runtime_settings() to:
- Set fastmcp.settings.log_level to the configured value
- Reconfigure logging with the new level

Fixes #1825

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

Co-authored-by: Jeremiah Lowin <jlowin@users.noreply.github.com>

src/fastmcp/utilities/mcp_server_config/v1/mcp_server_config.py

@@ -95,6 +95,21 @@ class Deployment(BaseModel):
         import os
         from pathlib import Path
 
+        # Apply log level to global settings
+        if self.log_level:
+            import fastmcp
+            from fastmcp.utilities.logging import configure_logging
+
+            # Update the global settings
+            fastmcp.settings.log_level = self.log_level
+
+            # Reconfigure logging with the new level
+            if fastmcp.settings.log_enabled:
+                configure_logging(
+                    level=self.log_level,
+                    enable_rich_tracebacks=fastmcp.settings.enable_rich_tracebacks,
+                )
+
         # Set environment variables with interpolation support
         if self.env:
             for key, value in self.env.items():