Implement KCA: web reimplementation of XCA PKI workflows

- kaya backend with OIDC sessions, API tokens, Postgres/Tortoise models
- AES-256-GCM private key storage and full certificate/CSR/CRL domain logic
- Sycamore/WASM SPA for vaults, keys, requests, certificates, CRLs and templates
- imports/exports, XCA .xdb migration, Docker Compose stack and tests

server/packages/kca-core/pyproject.toml

@@ -0,0 +1,18 @@
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "kca-core"
+version = "0.1.0"
+description = "Pure PKI domain logic for KCA (keys, names, extensions, certificates, CSRs, CRLs, templates, imports/exports)"
+readme = "README.md"
+requires-python = ">=3.10"
+dependencies = [
+    "cryptography>=44",
+    "paramiko>=3.5",
+]
+
+[tool.setuptools.packages.find]
+where = ["src"]
+namespaces = true