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>

ios/Platform/Platform/Features/Home/HomeViewModel.swift

@@ -0,0 +1,54 @@
+import SwiftUI
+import PhotosUI
+
+@Observable
+final class HomeViewModel {
+    var backgroundImage: UIImage?
+    var caloriesConsumed: Double = 0
+    var caloriesGoal: Double = 2000
+    var isLoading = false
+
+    private let bgKey = "homeBackgroundImage"
+    private let repo = FitnessRepository.shared
+
+    init() {
+        loadBackgroundFromDefaults()
+    }
+
+    func loadData() async {
+        isLoading = true
+        let today = Date().apiDateString
+        await repo.loadDay(date: today)
+        caloriesConsumed = repo.totalCalories
+        caloriesGoal = repo.goals.calories
+        isLoading = false
+    }
+
+    func setBackground(_ image: UIImage) {
+        // Resize to max 1200px
+        let maxDim: CGFloat = 1200
+        let scale = min(maxDim / image.size.width, maxDim / image.size.height, 1.0)
+        let newSize = CGSize(width: image.size.width * scale, height: image.size.height * scale)
+        UIGraphicsBeginImageContextWithOptions(newSize, false, 1.0)
+        image.draw(in: CGRect(origin: .zero, size: newSize))
+        let resized = UIGraphicsGetImageFromCurrentImageContext()
+        UIGraphicsEndImageContext()
+
+        if let resized, let data = resized.jpegData(compressionQuality: 0.8) {
+            UserDefaults.standard.set(data, forKey: bgKey)
+            backgroundImage = resized
+        }
+    }
+
+    func removeBackground() {
+        UserDefaults.standard.removeObject(forKey: bgKey)
+        backgroundImage = nil
+    }
+
+    private func loadBackgroundFromDefaults() {
+        if let data = UserDefaults.standard.data(forKey: bgKey),
+           let img = UIImage(data: data) {
+            backgroundImage = img
+        }
+    }
+}