feat: Variet Engine v1.0 + 5-model tuning complete

Phase 01 (LLM Tuning):
- Gemma4 26B: 74.65 t/s (fast)
- Qwen 35B: 61.62 t/s (balanced)
- Gemma4 31B: 16.0 t/s (deep-coder)
- Qwen 27B: 16.7 t/s (deep-logic)
- Qwen 122B: 8.95 t/s (ultra, GPU 1 only)

Phase 02 (API Engine):
- FastAPI reverse proxy on port 8000
- /engine/switch hot-swap with 503 protection
- config/engine_models.json as single source of truth
- Replaced 4 individual .bat files with unified engine

File cleanup:
- scripts/ 85 files -> 9 + _archive/
- Root .bat files -> _archive/

scripts/_archive/results/deep_tier_auto_results.json

@@ -0,0 +1,68 @@
+[
+  {
+    "name": "Qwen 27B - 256K (q4_0)",
+    "status": "Success",
+    "vram": [
+      "0, 10853 MiB, 12288 MiB",
+      "1, 10951 MiB, 12288 MiB"
+    ],
+    "tests": {
+      "code": {
+        "time": 17.89,
+        "tokens": 300,
+        "tps": 16.77,
+        "res": "..."
+      },
+      "logical": {
+        "time": 17.96,
+        "tokens": 300,
+        "tps": 16.71,
+        "res": "..."
+      }
+    }
+  },
+  {
+    "name": "Gemma 31B - 32K (q4_0)",
+    "status": "Success",
+    "vram": [
+      "0, 9834 MiB, 12288 MiB",
+      "1, 9963 MiB, 12288 MiB"
+    ],
+    "tests": {
+      "code": {
+        "time": 18.75,
+        "tokens": 300,
+        "tps": 16.0,
+        "res": "```python\nfrom typing import List, Any\n\ndef merge_sorted_lists(list1: List[Any], list2: List[Any]) -> List[Any]:\n    \"\"\"\n    Merges two sorted lists i..."
+      },
+      "logical": {
+        "time": 18.82,
+        "tokens": 300,
+        "tps": 15.94,
+        "res": "..."
+      }
+    }
+  },
+  {
+    "name": "Gemma 31B - 64K (q4_0)",
+    "status": "Success",
+    "vram": [
+      "0, 10346 MiB, 12288 MiB",
+      "1, 10387 MiB, 12288 MiB"
+    ],
+    "tests": {
+      "code": {
+        "time": 18.75,
+        "tokens": 300,
+        "tps": 16.0,
+        "res": "```python\nfrom typing import List, Any\n\ndef merge_sorted_lists(list1: List[Any], list2: List[Any]) -> List[Any]:\n    \"\"\"\n    Merges two sorted lists i..."
+      },
+      "logical": {
+        "time": 18.83,
+        "tokens": 300,
+        "tps": 15.93,
+        "res": "..."
+      }
+    }
+  }
+]