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

_bmad/core/bmad-init/resources/core-module.yaml

@@ -0,0 +1,25 @@
+code: core
+name: "BMad Core Module"
+
+header: "BMad Core Configuration"
+subheader: "Configure the core settings for your BMad installation.\nThese settings will be used across all installed bmad skills, workflows, and agents."
+
+user_name:
+  prompt: "What should agents call you? (Use your name or a team name)"
+  default: "BMad"
+  result: "{value}"
+
+communication_language:
+  prompt: "What language should agents use when chatting with you?"
+  default: "English"
+  result: "{value}"
+
+document_output_language:
+  prompt: "Preferred document output language?"
+  default: "English"
+  result: "{value}"
+
+output_folder:
+  prompt: "Where should output files be saved?"
+  default: "_bmad-output"
+  result: "{project-root}/{value}"