Extract 18 inline route handlers from registerReleaseRoutes()

[selfcontained]

Summary

• Extracted all 18 inline route handlers from the 901-line registerReleaseRoutes() in apps/server/src/routes/release.ts into standalone named functions
• Registration function reduced to ~40 lines of thin delegation, following the same pattern as the activity.ts (refactor: extract inline handlers from registerActivityRoutes() #773) and mcp-handlers.ts (Extract inline MCP handler methods into standalone functions #777) extractions
• Also promoted two closure helpers (getReleaseStreamClientId, emitInfoProgress) to module-level functions

What qualifies as tech debt

All business logic was defined inline within one 714-line function body. This made it hard to navigate, test, or understand individual route handlers in isolation.

Next up

The next debt-collector run will tackle: extracting sub-functions from the 233-line shutdown() method in apps/server/src/jobs/service.ts.

Test plan

• pnpm run check — TypeScript clean
• pnpm run test — 200/200 unit tests pass
• pnpm run test:e2e — 122/123 pass (1 pre-existing flake in split-pane.spec.ts)

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