fix: correct remote path handling in GenerateMCPServerURL

[amirejaz]

Fix remote path handling in GenerateMCPServerURL

This PR updates GenerateMCPServerURL to handle remote paths correctly:

• Use remote URL path as-is (/ normalized to empty).
• Append #<containerName> only for SSE/STDIO.
• No fragment for StreamableHTTP.
• Local constants (/sse, mcp) unchanged.

Examples

SSE / STDIO

• http://example.com → http://localhost:12345#test-container
• http://example.com/foo → http://localhost:12345/foo#test-container

StreamableHTTP

• http://example.com → http://localhost:12345
• http://example.com/mcp → http://localhost:12345/mcp

This makes remote path handling consistent, avoids injecting local defaults into remote configurations, and ensures correct fragment usage for SSE/STDIO.

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 42.17%. Comparing base (85875a3) to head (7dd31dc).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/transport/url.go	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1810      +/-   ##
==========================================
+ Coverage   42.08%   42.17%   +0.08%     
==========================================
  Files         184      184              
  Lines       21649    21662      +13     
==========================================
+ Hits         9112     9136      +24     
+ Misses      11843    11836       -7     
+ Partials      694      690       -4     

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[coveralls]

coverage: 39.15% (+0.05%) from 39.1%
when pulling 7dd31dc on fix/mcpserver-remote-path
into 85875a3 on main.