feat(bots): enable Redis SSO for todo-bot and calendar-bot

- Activate Redis session storage in both bots for cross-bot SSO
- Update SessionHelper to async methods for Redis-backed SessionService
- Fix async/await issues in todo-bot and calendar-bot matrix.service.ts
- Remove unused imports from calendar-api and todo-api services
- Add CALENDAR_BACKEND_URL and MANA_CORE_SERVICE_KEY to .env.development

Note: SessionService methods are now async (Redis-backed). Other bots
need their matrix.service.ts updated to await these async calls.

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

.env.development

@@ -14,6 +14,8 @@
 
 # Mana Core Auth Service
 MANA_CORE_AUTH_URL=http://localhost:3001
+# Service key for bot-to-auth communication (Matrix-SSO-Link)
+MANA_CORE_SERVICE_KEY=dev-service-key-for-bot-sso-2024
 
 # JWT Keys (shared across apps for token verification)
 JWT_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----\nMIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDGRsOXROB4lprw\n9oXaOIt+cwHe3UxBOoiWiUXcpFuXwb+kBWn/LyjeCIOXtefOwE0S10JEodK+6foe\naqGHanq86qAmmkb4a8sjj5LAxXkHL35sJo8HaYcx5NkJQLxQSRHpTfdfxsKsKwxa\n4R4uqrvToqdo6tl/VMsGDPS8L7KzaiKaSdGugvlVtXWgV1soeXSUPyPwpyAXQg7h\nY4CkTSkJAplrs77RLdj8u6jbHKR3F7QkwiU1JocjhM1GP/suKiqXRu8omLFnu45C\ns09SNSRsOpNY5csrKA4PZ2LCks9VHH7HafFvB+BbRw4+Ssr6myOysAztqi3bZMRW\nLTakWpBbAgMBAAECggEAF5zi0IzaghHxhtkyYfrSRgSynX9+WYBRNu2ch8/SZqAj\neghOXMkZgAPEjtiSMDGqRsr4ReMoYtB2Qea8sOX8kwC1gj4Po1Mhtez0cwexclUf\nebLH3X/y9/1YiZJk5YImOMIuaoC/ELDvFOhIEhJcMbKREbIc+oiMcH6HgN0vViVh\nJptgHTnqnGHNARkEpf+xnxqJJxEgrEMz50b4fApKpoZsWXNnZ3Atc/i2ziGew5z4\npnGJxs9TWSukBZaQvl9iluBBvqmPkCOId+L7CmB44bNURpqQOm8gxEgLcdn06y5j\nIKee3Z4H6OTseFvSIYYqBqCyyyZWHICBZXUCDQKUbQKBgQDnFe+O+pQc5looLFiF\nxuYsfDtJqvoMgQ0BaVAo6wVpPe6w+1NA6ZxghcM0+8zyc70jZvdMXINhdsfWD5Gi\nJ/NEDI8EXJJKMfnFQ7F1Ad5NyTnnn/TsLda4GIGQznPRS6uxUP4ljFtxmU9G8Diz\nUQ47XsLjwzzbTedMTSYoQ46kdwKBgQDbp0dIq047o4A72/BBttKdZbgQmjFmqCXF\n8YRUquIDXh/CJ4OQwOIaOvk2398Rg53c3MsV+XCJaMmWYqnJ4BdITLsqeGKsczoS\nI0DMehDr++aOoX/f29r1c+7J/fV5jtAEUcwIEOR1vyAM+WdiWnnTvdpMPVUDsgaT\ntuH0E8WgPQKBgQCCINci87Z+Q7VXVAmRY7zwJhEY3eArNGzHc6+BKz+D0S1dmll6\nf1LhA9I2PuldSpGiovP1m08cjk/gGipPXyHdGxlaQmravyPA0urWUfQGZ59k8K1y\nZim4x4wGqEuN+4e2tT44lL5VzRhYgSPcznMuOaGTsrjNYiQy0mr/V3O25wKBgHvV\nryaVDaIp553XvXgO7ma2djNF+xv5KHKUWxqwzINBiX4YcOAnHlHTdbUuOcDSByoB\ngK1+16dgYGZccYTSxc2JFOw4usimndKj9WBSYT/p4G4BNuqqNKO1HKbceoxxq20E\nAJd7jpGjkxo9cb/Nammp22yoF0niEDsvG+xTSVOxAoGBAMfxHYCMdPc625upCbqG\nkPSJJGYREKGad80OtXilYXLvBPzV65q32k2YZGjaicPKRAzj72KO4nfIu9SY6bfO\nBvXCtIcvllZQuxyd3Cd8MirujJodKwThLTMd4bAYYMXGz1/W6R6pzunZs5KEpgEr\nczy9Gk9WNp0t8vfzyZZ9aago\n-----END PRIVATE KEY-----"
@@ -220,6 +222,7 @@ CONTACTS_GOOGLE_REDIRECT_URI=http://localhost:5184/import?tab=google
 # ============================================
 
 CALENDAR_BACKEND_PORT=3014
+CALENDAR_BACKEND_URL=http://localhost:3014
 CALENDAR_DATABASE_URL=postgresql://manacore:devpassword@localhost:5432/calendar
 
 # Speech-to-Text Service (mana-stt)