[jay23606]

Fixes #165

Change

For Bun projects without a start script, select an existing module or main entry (trying its .ts path when the declared file is missing), then a file from scripts.dev without --watch, and finally src/index.ts or the existing index.ts fallback. This makes the Elysia template generate a command for its actual src/index.ts entry.

Validation

• Regression test on the clean base failed as expected: generated bun index.ts instead of bun src/index.ts.
• The same regression test passed on this branch; all five Bun start-command tests passed.
• npm run eslint passed.
• Full npm test on this branch: 318 passing, 10 pending, 48 failing. The clean-base run also failed under the same WSL-mounted Windows checkout with unrelated CRLF-sensitive snapshots and .dockerignore template errors. No files related to those failures changed.
• Docker image build and HTTP smoke test were not run.

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