chore: initialize monorepo with project scaffolding, configs, and CI setup

apps/blockchain-node/pyproject.toml

@@ -0,0 +1,37 @@
+[tool.poetry]
+name = "aitbc-blockchain-node"
+version = "0.1.0"
+description = "AITBC blockchain node service"
+authors = ["AITBC Team"]
+packages = [
+    { include = "aitbc_chain", from = "src" }
+]
+
+[tool.poetry.dependencies]
+python = "^3.11"
+fastapi = "^0.111.0"
+uvicorn = { extras = ["standard"], version = "^0.30.0" }
+sqlmodel = "^0.0.16"
+sqlalchemy = "^2.0.30"
+alembic = "^1.13.1"
+aiosqlite = "^0.20.0"
+websockets = "^12.0"
+pydantic = "^2.7.0"
+pydantic-settings = "^2.2.1"
+orjson = "^3.10.0"
+python-dotenv = "^1.0.1"
+httpx = "^0.27.0"
+uvloop = { version = "^0.19.0", optional = true }
+rich = "^13.7.1"
+cryptography = "^42.0.5"
+
+[tool.poetry.extras]
+uvloop = ["uvloop"]
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^8.2.0"
+pytest-asyncio = "^0.23.0"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"