feat: API - Auto-generating the CLI from the real API

Usage:

```
uv run tangle api
Usage: tangle api COMMAND

Call the Tangle API server.
 Commands:
admin
artifacts
component-libraries
component-library-pins
components
executions
pipeline-runs
published-components
secrets
users
```
TANGLE_API_URL="http://127.0.0.1:8000" TANGLE_API_TOKEN="XXX" uv run tangle api pipeline-runs set-annotation 0123 --key key1 --value value1
```

Debug:
```
uv run tangle api pipeline-runs set-annotation 12 --key k1 --value v1 --debug
PUT http://127.0.0.1:8000/api/pipeline_runs/12/annotations/k1?value=v1
```

Complex parameters can be read from string or JSON/YAML files.
Pydantic parameters are validated against the model classes.

Author: Ark-kun

tangle_cli/api/__init__.py

@@ -0,0 +1,54 @@
+"""Client access for the Tangle API CLI.
+
+The generated ``tangle api ...`` commands send their HTTP requests through a
+single, globally-initialized :class:`~tangle_cli.api.client.Client` instance.
+Use :func:`get_client` to obtain it and :func:`set_client` to override it
+(for example, to point at a different server or to inject authentication).
+
+The default client reads its configuration from the environment:
+
+* ``TANGLE_API_URL`` -- base URL of the API server
+  (default: ``http://127.0.0.1:8000``).
+* ``TANGLE_API_TOKEN`` -- if set, requests are sent with bearer authentication.
+"""
+
+import os
+
+from . import client
+
+__all__ = [
+    "AuthenticatedClient",
+    "Client",
+    "DEFAULT_BASE_URL",
+    "get_client",
+    "set_client",
+]
+
+AuthenticatedClient = client.AuthenticatedClient
+Client = client.Client
+
+DEFAULT_BASE_URL = "http://127.0.0.1:8000"
+
+_client: client.Client | None = None
+
+
+def _build_default_client() -> client.Client:
+    base_url = os.environ.get("TANGLE_API_URL", DEFAULT_BASE_URL)
+    token = os.environ.get("TANGLE_API_TOKEN")
+    if token:
+        return client.AuthenticatedClient(base_url=base_url, token=token)
+    return client.Client(base_url=base_url)
+
+
+def get_client() -> client.Client:
+    """Return the global API client, creating a default one if needed."""
+    global _client
+    if _client is None:
+        _client = _build_default_client()
+    return _client
+
+
+def set_client(client: client.Client) -> None:
+    """Replace the global API client used by the generated CLI commands."""
+    global _client
+    _client = client