fix: update Poetry configuration to modern pyproject.toml format

- Add root pyproject.toml for poetry check in dev_heartbeat.py
- Convert all packages from deprecated [tool.poetry.*] to [project.*] format
- Update aitbc-core, aitbc-sdk, aitbc-crypto, aitbc-agent-sdk packages
- Regenerate poetry.lock files for all packages
- Fix poetry check failing issue in development environment

This resolves the 'poetry check: FAIL' issue in dev_heartbeat.py while
maintaining all package dependencies and build compatibility.

packages/py/aitbc-sdk/pyproject.toml

@@ -1,23 +1,17 @@
-[tool.poetry]
+[project]
 name = "aitbc-sdk"
 version = "0.1.0"
-description = "AITBC client SDK for interacting with coordinator services"
-authors = ["AITBC Team <team@aitbc.dev>"]
+description = "AITBC SDK"
+authors = [
+    {name = "AITBC Team", email = "team@aitbc.dev"}
+]
 readme = "README.md"
-packages = [{include = "aitbc_sdk", from = "src"}]
-
-[tool.poetry.dependencies]
-python = "^3.13"
-httpx = "^0.27.0"
-pydantic = "^2.7.0"
-aitbc-crypto = {path = "../aitbc-crypto"}
-
-[tool.poetry.group.dev.dependencies]
-pytest = "^8.2.0"
-pytest-asyncio = "^0.23.0"
-black = "^26.3.1"
-isort = "^5.13.2"
-mypy = "^1.10.0"
+requires-python = "^3.13"
+dependencies = [
+    "cryptography>=41.0.0",
+    "requests>=2.31.0",
+    "pydantic>=2.5.0"
+]
 
 [build-system]
 requires = ["poetry-core"]