refactor(bot)!: rename 'ai procurement' -> 'bot/' so the compose build context is committed

The bot service in docker-compose.yml builds from ./bot, but the agent code lived in 'ai procurement/' and ./bot was only a Windows junction on reza.g's machine (and was gitignored) — exactly as the team reported: 'bot/ was never committed — prod-v7's bot is un-buildable from the repo.'

- junction removed; 'ai procurement/' renamed to 'bot/' via git mv (all 41 files keep their history as pure renames)
- 'bot/' dropped from .gitignore (voice/ stays ignored — runtime voice notes; bot/.env stays ignored by bot/.gitignore)
- compose needs no change: context: ./bot and ./bot/app now resolve to committed files
- bot/INTEGRATION-REPORT.md added: full story (problem, root cause, git state, security note on the committed BALE_BOT_TOKEN / AI_API_KEY compose defaults, and usage instructions for the team)

Verified: 41 renames staged with zero secret/cache files; voice/ and bot/.env still ignored.

bot/integration/x-actor-id.patch

@@ -0,0 +1,18 @@
+diff --git a/backend/app/utils/security.py b/backend/app/utils/security.py
+index a78c1cb..75e7349 100644
+--- a/backend/app/utils/security.py
++++ b/backend/app/utils/security.py
+@@ -7,7 +7,13 @@ def get_actor(request: Request) -> str | None:
+ 
+     This is the reserved placeholder from the contract — no authentication
+     or authorization is enforced yet.
++
++    Services acting on behalf of a user (the Bale bot) pass ``X-Actor-Id``
++    (users.id); it wins over the raw token so the audit trail shows the human.
+     """
++    actor_id = request.headers.get("X-Actor-Id")
++    if actor_id:
++        return actor_id.strip()
+     auth = request.headers.get("Authorization")
+     if auth and auth.lower().startswith("bearer "):
+         return auth[7:].strip() or None