fix: apply --host and --port CLI flags in apply_cli_overrides

[Maanik23]

Fixes #1333

Summary

The --host and --port CLI flags for graphiti-mcp-server were parsed by argparse but never applied to the ServerConfig, causing the server to always bind to 0.0.0.0:8000 regardless of what was passed.

Root Cause

apply_cli_overrides() in mcp_server/src/config/schema.py handled transport, LLM, embedder, database, and graphiti overrides but skipped host and port.

Changes

• mcp_server/src/config/schema.py: Added host and port overrides in apply_cli_overrides(), placed right after the existing transport override since they're all ServerConfig fields
  • Used args.port is not None (not args.port) to correctly handle port 0 as a valid value
• mcp_server/tests/test_configuration.py: Added assertions for host and port override, plus a separate test case verifying defaults are preserved when CLI flags are omitted

Verification

# Before: always binds to 0.0.0.0:8000
graphiti-mcp-server --transport sse --host 127.0.0.1 --port 9999

# After: correctly binds to 127.0.0.1:9999

Test plan

• Existing CLI override test updated with host/port assertions
• Added MinimalArgs test to verify defaults are preserved when flags are None
• Verified port=0 edge case is handled correctly (is not None vs truthy check)

[danielchalef]

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[Maanik23]

I have read the CLA Document and I hereby sign the CLA