feat: major platform expansion — Brain service, RSS reader, iOS app, AI assistants, Firefox extension

Brain Service:
- Playwright stealth crawler replacing browserless (og:image, Readability, Reddit JSON API)
- AI classification with tag definitions and folder assignment
- YouTube video download via yt-dlp
- Karakeep migration complete (96 items)
- Taxonomy management (folders with icons/colors, tags)
- Discovery shuffle, sort options, search (Meilisearch + pgvector)
- Item tag/folder editing, card color accents

RSS Reader Service:
- Custom FastAPI reader replacing Miniflux
- Feed management (add/delete/refresh), category support
- Full article extraction via Readability
- Background content fetching for new entries
- Mark all read with confirmation
- Infinite scroll, retention cleanup (30/60 day)
- 17 feeds migrated from Miniflux

iOS App (SwiftUI):
- Native iOS 17+ app with @Observable architecture
- Cookie-based auth, configurable gateway URL
- Dashboard with custom background photo + frosted glass widgets
- Full fitness module (today/templates/goals/food library)
- AI assistant chat (fitness + brain, raw JSON state management)
- 120fps ProMotion support

AI Assistants (Gateway):
- Unified dispatcher with fitness/brain domain detection
- Fitness: natural language food logging, photo analysis, multi-item splitting
- Brain: save/append/update/delete notes, search & answer, undo support
- Madiha user gets fitness-only (brain disabled)

Firefox Extension:
- One-click save to Brain from any page
- Login with platform credentials
- Right-click context menu (save page/link/image)
- Notes field for URL saves
- Signed and published on AMO

Other:
- Reader bookmark button routes to Brain (was Karakeep)
- Fitness food library with "Add" button + add-to-meal popup
- Kindle send file size check (25MB SMTP2GO limit)
- Atelier UI as default (useAtelierShell=true)
- Mobile upload box in nav drawer

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

services/brain/app/models/taxonomy.py

@@ -70,23 +70,24 @@ class ItemTag(Base):
 
 # Default folders with colors and icons
 DEFAULT_FOLDERS = [
-    {"name": "Home",      "color": "#059669", "icon": "home"},
-    {"name": "Family",    "color": "#D97706", "icon": "heart"},
-    {"name": "Work",      "color": "#4338CA", "icon": "briefcase"},
-    {"name": "Travel",    "color": "#0EA5E9", "icon": "plane"},
-    {"name": "Knowledge", "color": "#8B5CF6", "icon": "book-open"},
-    {"name": "Faith",     "color": "#10B981", "icon": "moon"},
-    {"name": "Projects",  "color": "#F43F5E", "icon": "folder"},
+    {"name": "Home",        "color": "#059669", "icon": "home"},
+    {"name": "Family",      "color": "#D97706", "icon": "heart"},
+    {"name": "Work",        "color": "#4338CA", "icon": "briefcase"},
+    {"name": "Travel",      "color": "#0EA5E9", "icon": "plane"},
+    {"name": "Islam",       "color": "#10B981", "icon": "moon"},
+    {"name": "Homelab",     "color": "#6366F1", "icon": "server"},
+    {"name": "Vanlife",     "color": "#F59E0B", "icon": "truck"},
+    {"name": "3D Printing", "color": "#EC4899", "icon": "printer"},
+    {"name": "Documents",   "color": "#78716C", "icon": "file-text"},
 ]
 
 # Default tags to seed for new users
 DEFAULT_TAGS = [
-    "reference", "important", "legal", "financial", "insurance",
-    "research", "idea", "guide", "tutorial", "setup", "how-to",
-    "tools", "dev", "server", "selfhosted", "home-assistant",
-    "shopping", "compare", "buy", "product",
-    "family", "kids", "health", "travel", "faith",
-    "video", "read-later", "books",
+    "diy", "reference", "home-assistant", "shopping", "video",
+    "tutorial", "server", "kids", "books", "travel",
+    "churning", "lawn-garden", "piracy", "work", "3d-printing",
+    "lectures", "vanlife", "yusuf", "madiha", "hafsa", "mustafa",
+    "medical", "legal", "vehicle", "insurance", "financial", "homeschool",
 ]