feat: rebuild iOS app from API audit + new podcast/media service

iOS App (complete rebuild):
- Audited all fitness API endpoints against live responses
- Models match exact API field names (snapshot_ prefixes, UUID strings)
- FoodEntry uses computed properties (foodName, calories, etc.) wrapping snapshot fields
- Flexible Int/Double decoding for all numeric fields
- AI assistant with raw JSON state management (JSONSerialization, not Codable)
- Home dashboard with custom background, frosted glass calorie widget
- Fitness: Today/Templates/Goals/Foods tabs
- Food search with recent + all sections
- Meal sections with colored accent bars, swipe to delete
- 120fps ProMotion, iOS 17+ @Observable

Podcast/Media Service:
- FastAPI backend for podcast RSS + local audiobook folders
- Shows, episodes, playback progress, queue management
- RSS feed fetching with feedparser + ETag support
- Local folder scanning with mutagen for audio metadata
- HTTP Range streaming for local audio files
- Playback events logging (play/pause/seek/complete)
- Reuses brain's PostgreSQL + Redis
- media_ prefixed tables

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

services/media/app/config.py

@@ -0,0 +1,35 @@
+"""Media service configuration — all from environment variables."""
+
+import os
+
+# ── Database ──
+DATABASE_URL = os.environ.get(
+    "DATABASE_URL",
+    "postgresql+asyncpg://brain:brain@brain-db:5432/brain",
+)
+DATABASE_URL_SYNC = DATABASE_URL.replace("+asyncpg", "")
+
+# ── Redis ──
+REDIS_URL = os.environ.get("REDIS_URL", "redis://brain-redis:6379/0")
+
+# ── Local audio ──
+LOCAL_AUDIO_PATH = os.environ.get("LOCAL_AUDIO_PATH", "/audiobooks")
+
+# ── Worker ──
+FEED_FETCH_INTERVAL = int(os.environ.get("FEED_FETCH_INTERVAL", "1800"))
+
+# ── Service ──
+PORT = int(os.environ.get("PORT", "8400"))
+DEBUG = os.environ.get("DEBUG", "").lower() in ("1", "true")
+
+# ── Audio extensions ──
+AUDIO_EXTENSIONS = {".mp3", ".m4a", ".ogg", ".opus", ".flac"}
+
+# ── Content types ──
+CONTENT_TYPES = {
+    ".mp3": "audio/mpeg",
+    ".m4a": "audio/mp4",
+    ".ogg": "audio/ogg",
+    ".opus": "audio/opus",
+    ".flac": "audio/flac",
+}