feat(matrix): add Stats Bot and Project Doc Bot services

Complete GDPR-compliant bot suite for Matrix:

matrix-stats-bot (port 3312):
- Analytics reports from Umami
- Commands: !stats, !today, !week, !realtime, !users
- Scheduled daily/weekly reports to Matrix room

matrix-project-doc-bot (port 3313):
- Project documentation with photos, voice, text
- Voice transcription via OpenAI Whisper
- Blog generation with 5 styles (casual, technical, tutorial, social, story)
- Commands: !new, !projects, !switch, !status, !generate, !export
- Uses PostgreSQL + S3 (MinIO) for storage

Changes:
- docker-compose.macmini.yml: Added both Matrix bots
- health-check.sh: Added health checks for both bots

Environment variables required:
- MATRIX_STATS_BOT_TOKEN, MATRIX_PROJECT_DOC_BOT_TOKEN
- OPENAI_API_KEY (for Project Doc Bot)

https://claude.ai/code/session_01E3r5aFW3YLAhEJfsL2ryhv

services/matrix-project-doc-bot/.env.example

@@ -0,0 +1,23 @@
+PORT=3313
+
+# Matrix
+MATRIX_HOMESERVER_URL=http://localhost:8008
+MATRIX_ACCESS_TOKEN=syt_xxx
+# Optional: Restrict to specific users (comma-separated)
+MATRIX_ALLOWED_USERS=
+MATRIX_STORAGE_PATH=./data/bot-storage.json
+
+# Database
+DATABASE_URL=postgresql://postgres:password@localhost:5432/project_doc_bot
+
+# S3 Storage
+S3_ENDPOINT=http://localhost:9000
+S3_REGION=us-east-1
+S3_ACCESS_KEY=minioadmin
+S3_SECRET_KEY=minioadmin
+S3_BUCKET=project-doc-bot
+
+# OpenAI
+OPENAI_API_KEY=
+OPENAI_MODEL=gpt-4o-mini
+OPENAI_WHISPER_MODEL=whisper-1