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.

pyproject.toml

@@ -0,0 +1,20 @@
+[project]
+name = "aitbc"
+version = "0.1.0"
+description = "AITBC Blockchain Platform"
+authors = [
+    {name = "AITBC Team", email = "team@aitbc.dev"}
+]
+requires-python = "^3.13"
+dependencies = [
+    "cryptography>=41.0.0",
+    "sqlmodel>=0.0.14", 
+    "fastapi>=0.104.0",
+    "uvicorn>=0.24.0",
+    "redis>=5.0.0",
+    "pydantic>=2.5.0"
+]
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"