**Changes:**
- Remove all comments from custom template (align with Claude/Gemini)
- Remove base_url field from template (user fills in form instead)
- Simplify getCodexCustomTemplate() - no locale parameter needed
- Keep preset configurations unchanged with their baseUrl values
**Template now contains only:**
- model_provider, model, model_reasoning_effort
- disable_response_storage
- [model_providers.custom] section with minimal fields
**Benefits:**
- ✅ Cleaner, more focused template
- ✅ Consistent with other apps (no comments)
- ✅ Forces users to fill base_url via form field
- ✅ Reduced template size from 35+ lines to 12 lines
Net change: -74 lines (codexTemplates.ts)
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