refactor: restructure test suite

- Remove tests/production/ directory (JWT auth, production monitoring, etc.)
- Remove tests/staking/ directory
- Remove tests/services/test_staking_service.py
- Remove tests/phase1/ directory
- Remove tests/load_test.py
- Add tests/verification/ directory with 20+ new test files
- Add tests/load/locustfile.py for load testing
- Add tests/security/test_confidential_transactions.py
- Add tests/integration/test_working_integration.py
- Update docs/ for minimum Python version and paths

tests/verification/test_host_miner.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""
+Test script for host GPU miner
+"""
+
+import subprocess
+import httpx
+
+# Test GPU
+print("Testing GPU access...")
+result = subprocess.run(['nvidia-smi', '--query-gpu=name', '--format=csv,noheader,nounits'], 
+                       capture_output=True, text=True)
+if result.returncode == 0:
+    print(f"✅ GPU detected: {result.stdout.strip()}")
+else:
+    print("❌ GPU not accessible")
+
+# Test Ollama
+print("\nTesting Ollama...")
+try:
+    response = httpx.get("http://localhost:11434/api/tags", timeout=5)
+    if response.status_code == 200:
+        models = response.json().get('models', [])
+        print(f"✅ Ollama running with {len(models)} models")
+        for m in models[:3]:  # Show first 3 models
+            print(f"   - {m['name']}")
+    else:
+        print("❌ Ollama not responding")
+except Exception as e:
+    print(f"❌ Ollama error: {e}")
+
+# Test Coordinator
+print("\nTesting Coordinator...")
+try:
+    response = httpx.get("http://127.0.0.1:8000/v1/health", timeout=5)
+    if response.status_code == 200:
+        print("✅ Coordinator is accessible")
+    else:
+        print("❌ Coordinator not responding")
+except Exception as e:
+    print(f"❌ Coordinator error: {e}")
+
+# Test Ollama inference
+print("\nTesting Ollama inference...")
+try:
+    response = httpx.post(
+        "http://localhost:11434/api/generate",
+        json={
+            "model": "llama3.2:latest",
+            "prompt": "Say hello",
+            "stream": False
+        },
+        timeout=10
+    )
+    if response.status_code == 200:
+        result = response.json()
+        print(f"✅ Inference successful: {result.get('response', '')[:50]}...")
+    else:
+        print("❌ Inference failed")
+except Exception as e:
+    print(f"❌ Inference error: {e}")
+
+print("\n✅ All tests completed!")