Refine end-to-end UX across auth, APIs, MCP, and pages

[tiankaima]

Summary

• refine OAuth/auth discovery and sign-in flows
• centralize REST route parsing and pagination behavior
• improve MCP compact results, recovery hints, and test coverage
• polish bus, dashboard, homework, and mobile page UX
• refresh runtime, seed, and snapshot tooling support

Verification

• bun run verify:full
• targeted API, MCP, and page E2E/integration coverage

Commits

1. refactor(auth): unify oauth discovery and sign-in flows
2. refactor(api): centralize route parsing and query helpers
3. feat(mcp): improve compact results and recovery hints
4. refactor(bus): streamline planner data and admin flows
5. feat(ui): polish dashboards, mobile lists, and detail flows
6. chore(tooling): refresh runtime and snapshot support

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🎉 This PR is included in version 1.30.0 🎉

The release is available on GitHub release

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