feat: add LANGFLOW_MCP_BASE_URL config for MCP server URL override

[ogabrielluiz]

Summary

• Adds LANGFLOW_MCP_BASE_URL setting so deployments behind reverse proxies can specify the correct external URL for MCP server configuration in the UI
• The frontend uses it as the highest-priority fallback when building MCP server URLs: mcp_base_url > api.defaults.baseURL > window.location.origin
• Trailing slashes are stripped to prevent double-slash URL construction
• Defaults to empty string (existing behavior unchanged)

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• Commit unit tests in branch feat/config-base-url

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[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.08%. Comparing base (acf2ae0) to head (737fdb7).
⚠️ Report is 2 commits behind head on release-1.9.0.

Files with missing lines	Patch %	Lines
src/frontend/src/types/zustand/utility/index.ts	0.00%	2 Missing ⚠️

❌ Your project status has failed because the head coverage (49.07%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                Coverage Diff                @@
##           release-1.9.0   #12523      +/-   ##
=================================================
+ Coverage          49.84%   50.08%   +0.24%     
=================================================
  Files               1930     1930              
  Lines             171890   172606     +716     
  Branches           25287    26539    +1252     
=================================================
+ Hits               85671    86456     +785     
+ Misses             85173    85105      -68     
+ Partials            1046     1045       -1     

Flag	Coverage Δ
backend	55.86% <ø> (-0.02%)	⬇️
frontend	48.99% <85.71%> (+0.37%)	⬆️
lfx	49.07% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...c/controllers/API/queries/config/use-get-config.ts	67.39% <100.00%> (+1.46%)	⬆️
...frontend/src/customization/utils/custom-mcp-url.ts	85.00% <100.00%> (+79.11%)	⬆️
src/frontend/src/stores/utilityStore.ts	100.00% <100.00%> (ø)
src/lfx/src/lfx/services/settings/base.py	74.00% <100.00%> (+0.11%)	⬆️
src/frontend/src/types/zustand/utility/index.ts	0.00% <0.00%> (ø)

... and 89 files with indirect coverage changes

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[erichare]

LGTM! Thanks @ogabrielluiz

[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	29.72% (31355/105494)	63.74% (3985/6251)	31.06% (732/2356)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
3112	0 💤	0 ❌	0 🔥	5m 11s ⏱️