fix(api): register knowledge pipeline service API routes (#32097)

Co-authored-by: Crazywoola <100913391+crazywoola@users.noreply.github.com>
Co-authored-by: FFXN <31929997+FFXN@users.noreply.github.com>

api/tests/unit_tests/controllers/service_api/dataset/test_rag_pipeline_route_registration.py

@@ -0,0 +1,54 @@
+"""
+Unit tests for Service API knowledge pipeline route registration.
+"""
+
+import ast
+from pathlib import Path
+
+
+def test_rag_pipeline_routes_registered():
+    api_dir = Path(__file__).resolve().parents[5]
+
+    service_api_init = api_dir / "controllers" / "service_api" / "__init__.py"
+    rag_pipeline_workflow = (
+        api_dir / "controllers" / "service_api" / "dataset" / "rag_pipeline" / "rag_pipeline_workflow.py"
+    )
+
+    assert service_api_init.exists()
+    assert rag_pipeline_workflow.exists()
+
+    init_tree = ast.parse(service_api_init.read_text(encoding="utf-8"))
+    import_found = False
+    for node in ast.walk(init_tree):
+        if not isinstance(node, ast.ImportFrom):
+            continue
+        if node.module != "dataset.rag_pipeline" or node.level != 1:
+            continue
+        if any(alias.name == "rag_pipeline_workflow" for alias in node.names):
+            import_found = True
+            break
+    assert import_found, "from .dataset.rag_pipeline import rag_pipeline_workflow not found in service_api/__init__.py"
+
+    workflow_tree = ast.parse(rag_pipeline_workflow.read_text(encoding="utf-8"))
+    route_paths: set[str] = set()
+
+    for node in ast.walk(workflow_tree):
+        if not isinstance(node, ast.ClassDef):
+            continue
+        for decorator in node.decorator_list:
+            if not isinstance(decorator, ast.Call):
+                continue
+            if not isinstance(decorator.func, ast.Attribute):
+                continue
+            if decorator.func.attr != "route":
+                continue
+            if not decorator.args:
+                continue
+            first_arg = decorator.args[0]
+            if isinstance(first_arg, ast.Constant) and isinstance(first_arg.value, str):
+                route_paths.add(first_arg.value)
+
+    assert "/datasets/<uuid:dataset_id>/pipeline/datasource-plugins" in route_paths
+    assert "/datasets/<uuid:dataset_id>/pipeline/datasource/nodes/<string:node_id>/run" in route_paths
+    assert "/datasets/<uuid:dataset_id>/pipeline/run" in route_paths
+    assert "/datasets/pipeline/file-upload" in route_paths