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 85.49618% with 323 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.85%. Comparing base (992b6c6) to head (fb72e45).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntrolplane/src/core/services/CompositionService.ts	90.73%	78 Missing ⚠️
router/core/init_config_poller.go	0.00%	41 Missing ⚠️
...g/controlplane/configpoller/split_config_poller.go	83.66%	23 Missing and 2 partials ⚠️
...rvices/graph/setGraphRouterCompatibilityVersion.ts	17.85%	21 Missing and 2 partials ⚠️
.../src/core/repositories/FederatedGraphRepository.ts	87.85%	17 Missing ⚠️
router/pkg/routerconfig/cdn/split_fetcher.go	86.55%	8 Missing and 8 partials ⚠️
...core/bufservices/feature-flag/updateFeatureFlag.ts	82.85%	12 Missing ⚠️
...e/bufservices/federated-graph/migrateFromApollo.ts	0.00%	11 Missing ⚠️
.../src/core/bufservices/monograph/updateMonograph.ts	8.33%	11 Missing ⚠️
...vices/federated-graph/createFederatedGraphToken.ts	0.00%	10 Missing ⚠️
... and 22 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2848       +/-   ##
===========================================
- Coverage   65.74%   40.85%   -24.90%     
===========================================
  Files         254     1025      +771     
  Lines       26546   129193   +102647     
  Branches        0     5981     +5981     
===========================================
+ Hits        17452    52776    +35324     
- Misses       7680    74662    +66982     
- Partials     1414     1755      +341     

Files with missing lines	Coverage Δ
...ntrolplane/src/core/bufservices/PlatformService.ts	83.08% <100.00%> (ø)
...src/core/bufservices/monograph/publishMonograph.ts	64.00% <100.00%> (ø)
...lane/src/core/bufservices/subgraph/moveSubgraph.ts	84.70% <100.00%> (ø)
...ne/src/core/bufservices/subgraph/updateSubgraph.ts	83.88% <100.00%> (ø)
...ane/src/core/repositories/FeatureFlagRepository.ts	86.83% <100.00%> (ø)
controlplane/src/db/models.ts	100.00% <ø> (ø)
controlplane/src/db/schema.ts	100.00% <100.00%> (ø)
controlplane/src/types/index.ts	100.00% <100.00%> (ø)
router/pkg/config/config.go	80.51% <ø> (ø)
router/pkg/routerconfig/client.go	9.67% <100.00%> (+9.67%)	⬆️
... and 32 more

... and 745 files with indirect coverage changes

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[github-actions]

Router image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-12b0e28bd0c1756dfcf8f5373c49794b1db8e870

[claude]

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