docs: add logs command reference and backend function best practices

[yoavf]

Summary

• Added logs command reference to CLI skill (correct syntax with --function flag)
• Added "Backend Function Best Practices" section to SDK skill covering:
  • Avoid scanning large collections with list()
  • Use filter() with specific conditions
  • Use pagination with skip
  • Use REST API for data migrations
• Fixed pre-existing bug: wrong log level values in troubleshooter docs (log and warn changed to warning)
• Added cross-reference to base44-troubleshooter for detailed logs docs

Motivation

During b44emoji development, we used bare npx base44 logs and got interleaved output from all functions, not realizing --function filtering existed. We also hit response size limits in Deno backend functions and had to redesign from scratch. These docs would have saved significant time.

Test plan

• Verify logs command flags match actual CLI implementation
• Verify log level values match LogLevelSchema in CLI source
• Check REST API inline URL is correct
• Verify troubleshooter cross-reference is accurate

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