feat: add My Scripts/Team Scripts tabs and Build button to Script Library

- Add language field to ScriptTemplateListItem frontend type
- Add mine/shared params to scriptsApi.getTemplates
- Update scriptGeneratorStore.loadTemplates to accept filter params
- Reorganize ScriptLibraryPage with tab bar (My Scripts / Team Scripts)
- Add "Build a New Script" button linking to /script-builder

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/types/scripts.ts

@@ -23,6 +23,7 @@ export interface ScriptTemplateListItem {
   requires_modules: string[]
   is_verified: boolean
   usage_count: number
+  language?: string | null
 }
 
 export interface ScriptParameterOption {