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/Dockerfile.api

@@ -0,0 +1,22 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends libpq-dev && rm -rf /var/lib/apt/lists/*
+RUN pip install --no-cache-dir --upgrade pip
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+RUN adduser --disabled-password --no-create-home appuser
+
+COPY --chown=appuser app/ app/
+
+EXPOSE 8400
+ENV PYTHONUNBUFFERED=1
+
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
+  CMD python3 -c "import urllib.request; urllib.request.urlopen('http://127.0.0.1:8400/api/health', timeout=3)" || exit 1
+
+USER appuser
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8400"]