♻️ 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/src/session/session.module.ts

@@ -0,0 +1,62 @@
+import { Module, DynamicModule, Global } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import { SessionService } from './session.service';
+import { SessionModuleOptions, SESSION_MODULE_OPTIONS } from './types';
+
+/**
+ * Shared session management module for Matrix bots
+ *
+ * Provides SessionService for managing user authentication sessions.
+ * Links Matrix user IDs to mana-core-auth JWT tokens.
+ *
+ * @example
+ * ```typescript
+ * // With explicit configuration
+ * @Module({
+ *   imports: [
+ *     SessionModule.register({
+ *       authUrl: 'http://mana-core-auth:3001',
+ *       sessionExpiryMs: 7 * 24 * 60 * 60 * 1000 // 7 days
+ *     })
+ *   ]
+ * })
+ *
+ * // With ConfigService (reads from auth.url or MANA_CORE_AUTH_URL)
+ * @Module({
+ *   imports: [SessionModule.forRoot()]
+ * })
+ * ```
+ */
+@Global()
+@Module({})
+export class SessionModule {
+	/**
+	 * Register module with explicit options
+	 */
+	static register(options: SessionModuleOptions = {}): DynamicModule {
+		return {
+			module: SessionModule,
+			imports: [ConfigModule],
+			providers: [
+				{
+					provide: SESSION_MODULE_OPTIONS,
+					useValue: options,
+				},
+				SessionService,
+			],
+			exports: [SessionService],
+		};
+	}
+
+	/**
+	 * Register module with ConfigService (reads auth.url or MANA_CORE_AUTH_URL from config)
+	 */
+	static forRoot(): DynamicModule {
+		return {
+			module: SessionModule,
+			imports: [ConfigModule],
+			providers: [SessionService],
+			exports: [SessionService],
+		};
+	}
+}