feat: analytics dashboards & two-tier feedback system (#78)

* docs: add analytics & user feedback design document

Covers team analytics, personal analytics, flow analytics,
step-level thumbs up/down feedback, and flow CSAT ratings.

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

* docs: add analytics & feedback implementation plan

12-task TDD plan covering session ratings, step feedback,
team/personal/flow analytics endpoints, and frontend pages.

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

* feat: add session_ratings table and analytics indexes

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

* feat: add SessionRating model and analytics schemas

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

* feat: add session CSAT rating endpoint with tests

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

* feat: add step thumbs feedback and /ratings alias routes

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

* feat: add team, personal, and flow analytics endpoints

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

* feat: add recharts, analytics types, and API client

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

* feat: add inline step thumbs up/down feedback during sessions

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

* feat: add CSAT rating modal after session completion

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

* feat: add Team Analytics page with charts and leaderboards

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

* feat: add Flow Analytics panel with step dropoff and CSAT data

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

* feat: add My Analytics page with personal stats and charts

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

---------

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

backend/app/models/__init__.py

@@ -17,6 +17,7 @@ from .refresh_token import RefreshToken
 from .audit_log import AuditLog
 from .password_reset_token import PasswordResetToken
 from .session_share import SessionShare, SessionShareView
+from .session_rating import SessionRating
 from .account_limit_override import AccountLimitOverride
 from .feature_flag import FeatureFlag, PlanFeatureDefault, AccountFeatureOverride
 from .platform_setting import PlatformSetting
@@ -47,6 +48,7 @@ __all__ = [
     "PasswordResetToken",
     "SessionShare",
     "SessionShareView",
+    "SessionRating",
     "AccountLimitOverride",
     "FeatureFlag",
     "PlanFeatureDefault",