feat: add rpc method to recompose feature flags

[wilsonrivera]

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Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/docs-website.
• I have read the Contributors Guide.

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[codecov]

Codecov Report

❌ Patch coverage is 95.55556% with 6 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (feat/split-configs@e673a39). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...e/bufservices/feature-flag/recomposeFeatureFlag.ts	96.61%	4 Missing ⚠️
...plane/src/core/bufservices/graph/recomposeGraph.ts	80.00%	2 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             feat/split-configs    #2848   +/-   ##
=====================================================
  Coverage                      ?   39.51%           
=====================================================
  Files                         ?      978           
  Lines                         ?   124458           
  Branches                      ?     5733           
=====================================================
  Hits                          ?    49177           
  Misses                        ?    73478           
  Partials                      ?     1803           

Files with missing lines	Coverage Δ
...ntrolplane/src/core/bufservices/PlatformService.ts	82.71% <100.00%> (ø)
...ntrolplane/src/core/services/CompositionService.ts	90.73% <100.00%> (ø)
controlplane/src/db/models.ts	100.00% <ø> (ø)
...plane/src/core/bufservices/graph/recomposeGraph.ts	89.18% <80.00%> (ø)
...e/bufservices/feature-flag/recomposeFeatureFlag.ts	96.61% <96.61%> (ø)

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[github-actions]

Router image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-e96bb345e3bddcb2f33fdaa91f1c4ea02580543d

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