msteams: implement Teams AI agent UX best practices (#51808)

Migrates the Teams extension from @microsoft/agents-hosting to the official Teams SDK (@microsoft/teams.apps + @microsoft/teams.api) and implements Microsoft's AI UX best practices for Teams agents.

- AI-generated label on all bot messages (Teams native badge + thumbs up/down)
- Streaming responses in 1:1 chats via Teams streaminfo protocol
- Welcome card with configurable prompt starters on bot install
- Feedback with reflective learning (negative feedback triggers background reflection)
- Typing indicators for personal + group chats (disabled for channels)
- Informative status updates (progress bar while LLM processes)
- JWT validation via Teams SDK createServiceTokenValidator
- User-Agent: teams.ts[apps]/<sdk-version> OpenClaw/<version> on outbound requests
- Fix copy-pasted image downloads (smba.trafficmanager.net auth allowlist)
- Pre-parse auth gate (reject unauthenticated requests before body parsing)
- Reflection dispatcher lifecycle fix (prevent leaked dispatchers)
- Colon-safe session filenames (Windows compatibility)
- Cooldown cache eviction (prevent unbounded memory growth)

Closes #51806

docs/.generated/config-baseline.json

@@ -24324,7 +24324,7 @@
         "network"
       ],
       "label": "Microsoft Teams",
-      "help": "Bot Framework; enterprise support.",
+      "help": "Teams SDK; enterprise support.",
       "hasChildren": true
     },
     {

docs/.generated/config-baseline.jsonl

@@ -2181,7 +2181,7 @@
 {"recordType":"path","path":"channels.mattermost.requireMention","kind":"channel","type":"boolean","required":false,"deprecated":false,"sensitive":false,"tags":["channels","network"],"label":"Mattermost Require Mention","help":"Require @mention in channels before responding (default: true).","hasChildren":false}
 {"recordType":"path","path":"channels.mattermost.responsePrefix","kind":"channel","type":"string","required":false,"deprecated":false,"sensitive":false,"tags":[],"hasChildren":false}
 {"recordType":"path","path":"channels.mattermost.textChunkLimit","kind":"channel","type":"integer","required":false,"deprecated":false,"sensitive":false,"tags":[],"hasChildren":false}
-{"recordType":"path","path":"channels.msteams","kind":"channel","type":"object","required":false,"deprecated":false,"sensitive":false,"tags":["channels","network"],"label":"Microsoft Teams","help":"Bot Framework; enterprise support.","hasChildren":true}
+{"recordType":"path","path":"channels.msteams","kind":"channel","type":"object","required":false,"deprecated":false,"sensitive":false,"tags":["channels","network"],"label":"Microsoft Teams","help":"Teams SDK; enterprise support.","hasChildren":true}
 {"recordType":"path","path":"channels.msteams.allowFrom","kind":"channel","type":"array","required":false,"deprecated":false,"sensitive":false,"tags":[],"hasChildren":true}
 {"recordType":"path","path":"channels.msteams.allowFrom.*","kind":"channel","type":"string","required":false,"deprecated":false,"sensitive":false,"tags":[],"hasChildren":false}
 {"recordType":"path","path":"channels.msteams.appId","kind":"channel","type":"string","required":false,"deprecated":false,"sensitive":false,"tags":[],"hasChildren":false}