feat: add AI provider commands with on-chain payment

- Create ai.py with serve and request commands
- request includes balance verification and payment via blockchain send
- serve runs FastAPI server and optionally registers jobs with coordinator
Update marketplace.py:
- Add gpu unregister command (DELETE endpoint)

pyproject.toml

@@ -162,11 +162,12 @@ requires = ["setuptools>=61.0", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools.packages.find]
-where = ["cli"]
-include = ["aitbc_cli*"]
+where = ["cli", "apps/coordinator-api"]
+include = ["aitbc_cli*", "aitbc*"]
 
 [tool.setuptools.package-dir]
 "aitbc_cli" = "cli/aitbc_cli"
+"aitbc" = "apps/coordinator-api/aitbc"
 
 [dependency-groups]
 dev = [