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/reader/app/config.py

@@ -0,0 +1,23 @@
+"""Reader service configuration — all from environment variables."""
+
+import os
+
+# ── Database (reuse Brain's PostgreSQL) ──
+DATABASE_URL = os.environ.get(
+    "DATABASE_URL",
+    "postgresql+asyncpg://brain:brain@brain-db:5432/brain",
+)
+DATABASE_URL_SYNC = DATABASE_URL.replace("+asyncpg", "")
+
+# ── Redis (reuse Brain's Redis) ──
+REDIS_URL = os.environ.get("REDIS_URL", "redis://brain-redis:6379/0")
+
+# ── Crawler (reuse Brain's Playwright crawler) ──
+CRAWLER_URL = os.environ.get("CRAWLER_URL", "http://brain-crawler:3100")
+
+# ── Service ──
+PORT = int(os.environ.get("PORT", "8300"))
+DEBUG = os.environ.get("DEBUG", "").lower() in ("1", "true")
+
+# ── Feed fetch interval (seconds) ──
+FEED_FETCH_INTERVAL = int(os.environ.get("FEED_FETCH_INTERVAL", "600"))