feat: AI chat conclusion + survey completion & management (#95)

* fix: increase assistant chat input height from 1 to 3 rows

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: add Anthropic prompt caching to assistant chat

Cache the static system prompt and conversation history prefix across
turns, reducing input token costs by ~80% on multi-turn conversations.
RAG context is intentionally uncached since it changes per query.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: add Microsoft Learn MCP integration + refine assistant system prompt

- Integrate Microsoft Learn MCP server via Anthropic's MCP connector
  for real-time documentation lookups (docs search, fetch, code samples)
- Refine system prompt: clear persona, structured answer guidelines,
  when to use RAG flows vs Microsoft Learn, guardrails against fabrication
- Add ENABLE_MCP_MICROSOFT_LEARN config toggle (default: True)
- Fix bugs from prior edit: wrong MCP URL, broken indentation, undefined
  usage/token variables, NOT_GIVEN for disabled MCP params
- Log MCP tool usage and cache performance

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* feat: AI chat session conclusion + survey completion & management

AI Assistant - Conclude Session:
- 3-step modal: select outcome (resolved/escalated/paused), add notes, AI-generated summary
- AI generates structured ticket notes from conversation transcript (PSA-ready format)
- Copy to clipboard for pasting into ticketing systems
- "Resume in New Chat" for paused sessions (pre-loads context into new chat)
- Backend: POST /chats/{id}/conclude endpoint, conclusion_summary/outcome/concluded_at fields
- Migration 048: add conclusion fields to assistant_chats

Survey Completion Flow:
- Email-to-self option after submission (branded HTML email with formatted responses)
- Finish button navigates to /survey/thank-you page
- Thank you page with close-window message and feedback email callout
- Already-submitted state updated with same messaging
- Backend: POST /survey/email-copy public endpoint

Survey Admin Management:
- Read/unread indicators (cyan dot, bold name, auto-mark on expand)
- Unread count stat card
- Per-row context menu: mark read/unread, archive/unarchive, delete
- Bulk actions bar: select all, mark read/unread, archive, delete
- Show Archived toggle to filter archived responses
- Backend: 7 new admin endpoints (read, unread, archive, unarchive, delete, bulk)
- Migration 049: add is_read, archived_at to survey_responses

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: initialize VerifyEmailPage state from token to avoid setState in effect

Moves the no-token error case from useEffect into initial state to satisfy
the react-hooks/set-state-in-effect ESLint rule.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/api/admin.ts

@@ -38,6 +38,8 @@ export interface SurveyResponseDetail {
   responses: Record<string, string | string[]>
   source: 'invite' | 'direct'
   invite_name: string | null
+  is_read: boolean
+  archived_at: string | null
   created_at: string
 }
 
@@ -45,6 +47,7 @@ export interface SurveyResponseListResponse {
   responses: SurveyResponseDetail[]
   total: number
   this_week: number
+  unread: number
 }
 
 export const adminApi = {
@@ -175,10 +178,22 @@ export const adminApi = {
     api.post<SurveyInviteResponse>('/admin/survey-invites', data).then(r => r.data),
 
   // Survey Responses
-  listSurveyResponses: () =>
-    api.get<SurveyResponseListResponse>('/admin/survey-responses').then(r => r.data),
+  listSurveyResponses: (includeArchived = false) =>
+    api.get<SurveyResponseListResponse>('/admin/survey-responses', { params: { include_archived: includeArchived } }).then(r => r.data),
   exportSurveyResponsesCsv: () =>
     api.get('/admin/survey-responses/export', { responseType: 'blob' }).then(r => r.data),
+  markResponseRead: (id: string) =>
+    api.put(`/admin/survey-responses/${id}/read`).then(r => r.data),
+  markResponseUnread: (id: string) =>
+    api.put(`/admin/survey-responses/${id}/unread`).then(r => r.data),
+  archiveResponse: (id: string) =>
+    api.put(`/admin/survey-responses/${id}/archive`).then(r => r.data),
+  unarchiveResponse: (id: string) =>
+    api.put(`/admin/survey-responses/${id}/unarchive`).then(r => r.data),
+  deleteResponse: (id: string) =>
+    api.delete(`/admin/survey-responses/${id}`),
+  bulkActionResponses: (action: string, ids: string[]) =>
+    api.post('/admin/survey-responses/bulk', { action, ids }).then(r => r.data),
 }
 
 export default adminApi