♻️ refactor: consolidate SessionService & TranscriptionService in @manacore/bot-services

Created shared services to eliminate code duplication across Matrix bots:

**New Services in @manacore/bot-services:**
- SessionService: User authentication via mana-core-auth (was duplicated in 11 bots)
- TranscriptionService: Speech-to-text via mana-stt (was duplicated in 6 bots)

**Migrated Bots:**
- matrix-todo-bot: uses TranscriptionService
- matrix-picture-bot: uses SessionService
- matrix-clock-bot: uses TranscriptionService
- matrix-zitare-bot: uses both SessionService & TranscriptionService

**Code Reduction:**
- Removed ~300 lines of duplicate code from migrated bots
- Centralized service configuration via NestJS modules
- Added comprehensive documentation in CLAUDE.md

Remaining bots can be migrated following the same pattern documented
in packages/bot-services/CLAUDE.md.

Note: @storage/backend type-check fails due to pre-existing drizzle-orm issue

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/bot-services/package.json

@@ -11,6 +11,8 @@
 		"./calendar": "./src/calendar/index.ts",
 		"./clock": "./src/clock/index.ts",
 		"./ai": "./src/ai/index.ts",
+		"./session": "./src/session/index.ts",
+		"./transcription": "./src/transcription/index.ts",
 		"./nutrition": "./src/nutrition/index.ts",
 		"./quotes": "./src/quotes/index.ts",
 		"./stats": "./src/stats/index.ts",