feat: implement dual-backend analysis workspace UX

- add Home, Knowledge, and Analysis Agent primary navigation
- promote Knowledge setup into a first-class workspace page
- wire Golang orchestration flows for auth, knowledge, analysis, and messages
- wire Python agentic flows for chat, Help, reports, and traceability
- move AI traceability into collapsible answer-level sections
- add collapsible report sidebar with version preview
- add backend diagnostics and clearer blocker/error states
- update spec-kit tasks and quickstart validation notes

README.md

@@ -1,6 +1,6 @@
 ---
 title: E2E Frontend Data Eyond
-emoji: chart_with_upwards_trend
+emoji: 📈
 colorFrom: green
 colorTo: slate
 sdk: docker