fix: resolve unevaluated server functions in dev

[brenelz]

Summary

• lazily resolve unregistered development server functions to their owning modules
• scan transformed files first and fall back to project files after dev-server restarts
• invalidate server-function manifests across all Vite environments

Verification

• pnpm --filter @solidjs/start typecheck
• pnpm --filter @solidjs/start validate-imports
• pnpm exec oxfmt --check packages/start/src/directives/index.ts packages/start/src/fns/handler.ts packages/start/src/fns/registration.ts
• git diff --check
• pnpm --filter @solidjs/start test:ci (31 tests pass; 2 existing handler.spec.ts tests fail because ./server-functions-handler.ts does not exist)

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commit: eebb81e