fix(docs): externalize new padrone subpath entry points

[KurtGokhan]

Summary

The Deploy Docs workflow on main broke after #15 (run). The docs build bundles @padrone/tasks-example, which now imports padrone/ink. Vite's resolve.external list in docs/astro.config.mts only had padrone and padrone/zod, so Rollup failed to resolve the new subpath:

[vite]: Rollup failed to resolve import "padrone/ink" from
"…/examples/padrone-example/src/tasks.ts".

Adding the new subpath entry points (padrone/ink, padrone/mcp, padrone/serve, padrone/tracing, padrone/completion, padrone/man) to the external list restores the build.

Test plan

• Reproduced the failure locally with a clean docs build (no padrone/dist)
• Confirmed bun run build from docs/ succeeds after the fix
• No source/tests/typecheck changes — root bun run checks already green on main

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