[refactor] Reorganize CLAUDE.md into hierarchical subdirectory files (#4640)

src/CLAUDE.md

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+# Source Code Guidelines
+
+## Service Layer
+
+### API Calls
+
+- Use `api.apiURL()` for backend endpoints
+- Use `api.fileURL()` for static files
+- Examples:
+  - Backend: `api.apiURL('/prompt')`
+  - Static: `api.fileURL('/templates/default.json')`
+
+### Error Handling
+
+- User-friendly and actionable messages
+- Proper error propagation
+
+### Security
+
+- Sanitize HTML with DOMPurify
+- Validate trusted sources
+- Never log secrets
+
+## State Management (Stores)
+
+### Store Design
+
+- Follow domain-driven design
+- Clear public interfaces
+- Restrict extension access
+
+### Best Practices
+
+- Use TypeScript for type safety
+- Implement proper error handling
+- Clean up subscriptions
+- Avoid @ts-expect-error
+
+## General Guidelines
+
+- Use lodash for utility functions
+- Implement proper TypeScript types
+- Follow Vue 3 composition API style guide
+- Use vue-i18n for ALL user-facing strings in `src/locales/en/main.json`

src/components/CLAUDE.md

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+# Component Guidelines
+
+## Vue 3 Composition API
+
+- Use setup() function
+- Destructure props (Vue 3.5 style)
+- Use ref/reactive for state
+- Implement computed() for derived state
+- Use provide/inject for dependency injection
+
+## Component Communication
+
+- Prefer `emit/@event-name` for state changes
+- Use `defineExpose` only for imperative operations (`form.validate()`, `modal.open()`)
+- Events promote loose coupling
+
+## UI Framework
+
+- Deprecated PrimeVue component replacements:
+  - Dropdown → Select
+  - OverlayPanel → Popover
+  - Calendar → DatePicker
+  - InputSwitch → ToggleSwitch
+  - Sidebar → Drawer
+  - Chips → AutoComplete with multiple enabled
+  - TabMenu → Tabs without panels
+  - Steps → Stepper without panels
+  - InlineMessage → Message
+
+## Styling
+
+- Use Tailwind CSS only (no custom CSS)
+- Dark theme: use "dark-theme:" prefix
+- For common operations, try to use existing VueUse composables that automatically handle effect scope
+  - Example: Use `useElementHover` instead of manually managing mouseover/mouseout event listeners
+  - Example: Use `useIntersectionObserver` for visibility detection instead of custom scroll handlers
+
+## Best Practices
+
+- Extract complex conditionals to computed
+- Implement cleanup for async operations
+- Use vue-i18n for ALL UI strings
+- Use lifecycle hooks: onMounted, onUpdated
+- Use Teleport/Suspense when needed
+- Proper props and emits definitions