Add Projects, Milestones, RAG auto-inject, push notifications, PWA, tag normalisation

## Projects & Milestones (Phases A + G)
- New models: Project, Milestone (Project → Milestone → Task hierarchy)
- notes table: project_id + milestone_id FKs; parent_id FK constraint activated
- Migrations: 0017 (projects), 0018 (push_subscriptions), 0019 (events), 0020 (milestones)
- Services: projects.py, milestones.py (CRUD + progress tracking)
- Routes: /api/projects + /api/projects/<id>/milestones
- LLM tools: create/list/get/update project; create/list milestone; project + milestone + parent_task params on note/task tools
- Frontend: ProjectListView (stacked milestone bars), ProjectView (milestone-grouped kanban), ProjectSelector, MilestoneSelector, NoteEditorView + TaskEditorView updated

## RAG Auto-injection (Phase B)
- Notes ≥0.60 cosine similarity auto-injected into system prompt (max 3, 800 chars each)
- excluded_note_ids param; ChatView "Auto-included" sidebar section

## Summarisation improvements (Phase C)
- Threshold 20→30, keep-recent 6→8, max_tokens 200→400
- Two-pass summarisation for histories >50 messages

## Browser push notifications (Phase E)
- PushSubscription model + migration; pywebpush dependency
- /api/push routes; VAPID config; fire-and-forget on generation complete
- Frontend: sw.js, push store, Settings toggle

## PWA manifest (Phase F)
- manifest.json, Apple meta tags, service worker registration in main.ts

## Tag normalisation
- All tags lowercased + deduplicated at backend (create_note/update_note) and frontend (TagInput sanitize)
- Note/Task types gain project_id + milestone_id fields; store signatures updated

## CalDAV
- Radicale embedded server reverted; back to user-configured external CalDAV

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

src/fabledassistant/app.py

@@ -14,6 +14,9 @@ from fabledassistant.routes.auth import auth_bp
 from fabledassistant.routes.chat import chat_bp
 from fabledassistant.routes.notes import notes_bp
 from fabledassistant.routes.images import images_bp
+from fabledassistant.routes.milestones import milestones_bp
+from fabledassistant.routes.projects import projects_bp
+from fabledassistant.routes.push import push_bp
 from fabledassistant.routes.quick_capture import quick_capture_bp
 from fabledassistant.routes.settings import settings_bp
 from fabledassistant.routes.tasks import tasks_bp
@@ -46,7 +49,10 @@ def create_app() -> Quart:
     app.register_blueprint(auth_bp)
     app.register_blueprint(chat_bp)
     app.register_blueprint(images_bp)
+    app.register_blueprint(milestones_bp)
     app.register_blueprint(notes_bp)
+    app.register_blueprint(projects_bp)
+    app.register_blueprint(push_bp)
     app.register_blueprint(quick_capture_bp)
     app.register_blueprint(settings_bp)
     app.register_blueprint(tasks_bp)
@@ -91,7 +97,8 @@ def create_app() -> Quart:
             "Content-Security-Policy",
             "default-src 'self'; script-src 'self' 'unsafe-inline'; "
             "style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; "
-            "connect-src 'self'; font-src 'self' data:; object-src 'none'; base-uri 'self';"
+            "connect-src 'self'; font-src 'self' data:; object-src 'none'; "
+            "base-uri 'self'; worker-src 'self';"
         )
 
         return response