feat: add reminders page, BMad skills upgrade, MCP server refactor

- Add reminders page with navigation support
- Upgrade BMad builder module to skills-based architecture
- Refactor MCP server: extract tools and auth into separate modules
- Add connections cache, custom AI provider support
- Update prisma schema and generated client
- Various UI/UX improvements and i18n updates
- Add service worker for PWA support

Made-with: Cursor

.opencode/skills/bmad-create-prd/templates/prd-template.md

@@ -0,0 +1,10 @@
+---
+stepsCompleted: []
+inputDocuments: []
+workflowType: 'prd'
+---
+
+# Product Requirements Document - {{project_name}}
+
+**Author:** {{user_name}}
+**Date:** {{date}}