[WIP] Fix or implement missing stuff

[Copilot]

Based on the comprehensive analysis in docs/COMPREHENSIVE_E2E_ANALYSIS_FINAL_REPORT.md and docs/IMPLEMENTATION_PRIORITY_CHECKLIST.md, I'm implementing fixes for critical missing and broken functionality in GödelOS.

Implementation Plan:

Phase 1: Critical Backend Fixes ⚡ (High Priority)

• Fix POST /api/knowledge endpoint (422 validation errors)
• Fix GET /api/knowledge/search endpoint (missing query parameters)
• Fix all knowledge import endpoints (URL, Wikipedia, text, batch)
• Fix knowledge item retrieval (404 errors)
• Update backend models to match frontend payload expectations

Phase 2: Frontend Component Integration 🔌 (Medium Priority)

• Connect TransparencyDashboard.svelte to working transparency APIs
• Add knowledge search interface to KnowledgeGraph.svelte
• Enhance SmartImport.svelte with progress tracking and error handling
• Wire existing components to backend endpoints

Phase 3: Advanced Features 🚀 (Lower Priority)

• Implement ReasoningSessionViewer.svelte for real-time transparency
• Add provenance tracking UI components
• Enhance batch import operations
• Add comprehensive error handling across components

Current Status: 48.7% backend success rate, 31.6% frontend coverage
Target: 85%+ backend success, 80%+ frontend coverage

Fixes #18.

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