fix(providers): fix the 3 CI checks still failing on SAGG PR

lint: the real cause was never F401 (that step already passed) - it
was scripts/test_quality_gate.py's TQ003 rule, which flags
sys.path.insert as unnecessary since pytest's rootdir handling and the
installed package already make litellm importable. Removed it along
with the now-unneeded os/sys imports and the __main__ block that
depended on it, matching test_scx_ai_provider.py's cleaner convention.
Confirmed directly: scripts/check_test_quality.py now reports 0
violations on this file (it still reports 2 on test_xiaomi_mimo.py,
the template this was built from - grandfathered only because it
predates the gate).

code-quality: check_provider_folders_documented.py requires every
litellm/llms/openai_like/providers.json entry to have a matching entry
in provider_endpoints_support.json. sagg had none. Added one,
chat_completions only (the only endpoint actually verified in this
PR's own proof of fix) - confirmed the check now passes, and fails
again with the exact expected error when the entry is removed.

osv-scan: not caused by this PR. Zero dependency/lockfile files are
touched anywhere in this diff. Cross-checked two other open,
unrelated PRs against the same base branch: one also failed osv-scan
in the same time window this PR's check ran, the other two (scanned
~4.5 hours later) both passed - a transient, time-bound,
repo-wide/base-branch issue, not something this PR introduced or can
fix.

provider_endpoints_support.json

@@ -2191,6 +2191,22 @@
         "interactions": true
       }
     },
+    "sagg": {
+      "display_name": "SAGG (`sagg`)",
+      "url": "https://docs.litellm.ai/docs/providers/sagg",
+      "endpoints": {
+        "chat_completions": true,
+        "messages": false,
+        "responses": false,
+        "embeddings": false,
+        "image_generations": false,
+        "audio_transcriptions": false,
+        "audio_speech": false,
+        "moderations": false,
+        "batches": false,
+        "rerank": false
+      }
+    },
     "searxng": {
       "display_name": "SearXNG (`searxng`)",
       "url": "https://docs.litellm.ai/docs/search/searxng",

tests/test_litellm/llms/openai_like/test_sagg_provider.py

@@ -5,13 +5,6 @@ SAGG (https://api.privatedeskai.com) is an OpenAI-compatible LLM
 inference gateway with automatic multi-provider failover.
 """
 
-import os
-import sys
-
-# Add workspace to path
-workspace_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "../../../.."))
-sys.path.insert(0, workspace_path)
-
 import litellm
 
 
@@ -91,33 +84,3 @@ class TestSaggProviderConfig:
         assert result["max_tokens"] == 100
         assert "max_completion_tokens" not in result
         assert result["temperature"] == 0.7
-
-
-if __name__ == "__main__":
-    print("Testing SAGG Provider...")
-
-    test_config = TestSaggProviderConfig()
-
-    print("\n1. Testing provider in list...")
-    test_config.test_sagg_in_provider_list()
-    print("   ✓ sagg in provider list")
-
-    print("\n2. Testing JSON config...")
-    test_config.test_sagg_json_config_exists()
-    print("   ✓ sagg JSON config loaded")
-
-    print("\n3. Testing provider resolution...")
-    test_config.test_sagg_provider_resolution()
-    print("   ✓ Provider resolution works")
-
-    print("\n4. Testing router configuration...")
-    test_config.test_sagg_router_config()
-    print("   ✓ Router configuration works")
-
-    print("\n5. Testing parameter mapping...")
-    test_config.test_sagg_parameter_mapping()
-    print("   ✓ Parameter mapping works")
-
-    print("\n" + "=" * 50)
-    print("✓ All configuration tests passed!")
-    print("=" * 50)