Add read-only Debug API support and update documentation

- Introduced a local read-only Debug API accessible at `http://127.0.0.1:17821` for diagnostics and agent interactions.
- Updated CLI commands to include `gpu-rent debug` for launching the Debug API.
- Enhanced documentation to reflect the new Debug API features and usage.
- Modified configuration to include `DEBUG_LOCAL_PORT` for easier customization.
- Added tests to ensure Debug API links are correctly generated in access card outputs.

tests/test_access_card.py

@@ -6,6 +6,7 @@ class _Cfg:
     llm_runtime = "ollama"
     ollama_local_port = 17811
     enable_swarmui = True
+    debug_local_port = 17821
 
 
 def test_collect_links_swarm_and_ollama(monkeypatch):
@@ -15,16 +16,20 @@ def test_collect_links_swarm_and_ollama(monkeypatch):
     )
     links = collect_access_links(_Cfg(), tunneled=True)
     labels = [x.label for x in links]
+    assert "Debug API" in labels
     assert "SwarmUI UI" in labels
     assert "Assistent" in labels
     assert "SwarmUI MCP" in labels
     assert "Ollama API" in labels
     assert any(x.label == "Assistent" and "вкладка" in x.note for x in links)
+    dbg = next(x for x in links if x.label == "Debug API")
+    assert dbg.url == "http://127.0.0.1:17821/"
 
 
 def test_collect_links_no_tunnel():
     links = collect_access_links(_Cfg(), tunneled=False)
-    assert links[0].url.startswith("gpu-rent tunnel")
+    assert links[0].label == "Debug API"
+    assert any(x.url.startswith("gpu-rent tunnel") for x in links)
 
 
 def test_mcp_snippet_json():