fix(mcp): add readonly guard to createHandler

[Elvand-Lie]

Problem

The createHandler in pkg/mcp/tools_create.go lacks the s.readonly.Load() check that is present in other mutating tools like deployHandler and deleteHandler.

Because of this, an MCP client can execute the create command (which writes project scaffolding files to the disk) even when the server is operating in readonly mode.

Fix

Added the s.readonly.Load() guard to match the behavior of other tools.

Fixes #3810

[knative-prow]

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[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.53%. Comparing base (ad6edb6) to head (86fa702).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3811      +/-   ##
==========================================
- Coverage   53.42%   52.53%   -0.89%     
==========================================
  Files         200      200              
  Lines       23426    23445      +19     
==========================================
- Hits        12515    12318     -197     
- Misses       9655     9882     +227     
+ Partials     1256     1245      -11     

Flag	Coverage Δ
e2e	21.73% <0.00%> (-11.97%)	⬇️
e2e go	29.66% <0.00%> (+0.01%)	⬆️
e2e node	25.96% <0.00%> (+0.09%)	⬆️
e2e python	29.99% <0.00%> (+0.01%)	⬆️
e2e quarkus	26.07% <0.00%> (+0.09%)	⬆️
e2e rust	25.52% <0.00%> (+0.08%)	⬆️
e2e springboot	24.19% <0.00%> (+0.08%)	⬆️
e2e typescript	26.05% <0.00%> (+0.09%)	⬆️
e2e-config-ci	26.78% <0.00%> (+0.02%)	⬆️
integration	15.76% <0.00%> (+0.13%)	⬆️
unit macos-14	42.24% <100.00%> (+0.04%)	⬆️
unit macos-latest	42.24% <100.00%> (+0.04%)	⬆️
unit ubuntu-24.04-arm	42.55% <100.00%> (+0.04%)	⬆️
unit ubuntu-latest	43.11% <100.00%> (+0.04%)	⬆️
unit windows-latest	42.31% <100.00%> (+0.07%)	⬆️

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