feat(ui): auto-detect HIGH/LOW badges and auto-tag filters (#918)

- Backend auto-tag extraction service: detect HIGH/LOW (Wan-only), I2V/T2V/TI2V,
  Lightning/Turbo from filename, base_model, and CivitAI version name
- HIGH/LOW badge in card footer (inline before version name), color-coded:
  blue for HIGH, teal for LOW; abbreviated to H/L in medium/compact density
- Auto-tag filter panel (I2V, T2V, TI2V, Lightning, Turbo) with tri-state
  include/exclude filtering
- Full filter pipeline: FilterCriteria → ModelFilterSet → baseModelApi params
- AUTO_TAG_GROUPS exported for frontend use
- 19 unit tests for auto-tag extraction edge cases

tests/test_auto_tag_service.py

@@ -0,0 +1,151 @@
+import pytest
+import sys
+import os
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "py"))
+
+from services.auto_tag_service import extract_auto_tags, AUTO_TAG_CATEGORIES
+
+
+class TestExtractAutoTags:
+    def test_file_name_high_i2v(self):
+        result = extract_auto_tags({
+            "file_name": "Shirt_lift_Wan2.2_14B_I2V_HIGH_v1.0",
+            "base_model": "Wan Video 2.2 I2V-A14B",
+            "civitai": {},
+        })
+        assert set(result) == {"HIGH", "I2V"}
+
+    def test_file_name_t2v_low(self):
+        result = extract_auto_tags({
+            "file_name": "my_wan_t2v_low_v2",
+            "base_model": "Wan 2.1",
+            "civitai": {},
+        })
+        assert set(result) == {"LOW", "T2V"}
+
+    def test_file_name_ti2v_high(self):
+        result = extract_auto_tags({
+            "file_name": "wan_ti2v_high_quality",
+            "base_model": "Wan 2.2",
+            "civitai": {},
+        })
+        assert set(result) == {"HIGH", "TI2V"}
+
+    def test_file_name_lightning_turbo(self):
+        result = extract_auto_tags({
+            "file_name": "sdxl_lightning_turbo_v3",
+            "base_model": "SDXL",
+            "civitai": {},
+        })
+        assert set(result) == {"Lightning", "Turbo"}
+
+    def test_base_model_source(self):
+        result = extract_auto_tags({
+            "file_name": "my_lora_v1",
+            "base_model": "Wan Video 2.2 I2V-A14B",
+            "civitai": {},
+        })
+        assert "I2V" in result
+
+    def test_civitai_name_source(self):
+        result = extract_auto_tags({
+            "file_name": "model_v1",
+            "base_model": "Wan",
+            "civitai": {"name": "HIGH Quality"},
+        })
+        assert "HIGH" in result
+
+    def test_no_false_match_flow(self):
+        result = extract_auto_tags({
+            "file_name": "flux_dev_model",
+            "base_model": "Flux.1 D",
+            "civitai": {},
+        })
+        assert "LOW" not in result
+
+    def test_no_false_match_glow(self):
+        result = extract_auto_tags({
+            "file_name": "glow_style_lora",
+            "base_model": "SDXL",
+            "civitai": {},
+        })
+        assert "LOW" not in result
+
+    def test_high_low_only_for_wan(self):
+        """HIGH/LOW should not appear for non-Wan models even in filename."""
+        result = extract_auto_tags({
+            "file_name": "my_model_high_quality_v2",
+            "base_model": "Flux.1 D",
+            "civitai": {"name": "HIGH"},
+        })
+        assert "HIGH" not in result
+        assert "LOW" not in result
+
+    def test_no_distilled(self):
+        result = extract_auto_tags({
+            "file_name": "ltx-2.3-22b-distilled-lora-384",
+            "base_model": "LTXV 2.3",
+            "civitai": {},
+        })
+        assert result == []
+
+    def test_empty(self):
+        result = extract_auto_tags({
+            "file_name": "generic_lora_v1",
+            "base_model": "SDXL",
+            "civitai": {},
+        })
+        assert result == []
+
+    def test_missing_fields(self):
+        result = extract_auto_tags({})
+        assert result == []
+
+    def test_dash_separated(self):
+        result = extract_auto_tags({
+            "file_name": "wan-i2v-high-v2",
+            "base_model": "Wan 2.2",
+            "civitai": {},
+        })
+        assert set(result) == {"HIGH", "I2V"}
+
+    def test_dot_separated(self):
+        result = extract_auto_tags({
+            "file_name": "wan.i2v.high.v2",
+            "base_model": "Wan 2.2",
+            "civitai": {},
+        })
+        assert set(result) == {"HIGH", "I2V"}
+
+    def test_case_insensitive(self):
+        result = extract_auto_tags({
+            "file_name": "WAN_i2v_High",
+            "base_model": "Wan 2.2",
+            "civitai": {},
+        })
+        assert set(result) == {"HIGH", "I2V"}
+
+
+class TestAutoTagCategories:
+    def test_all_patterns_compile(self):
+        import re
+        for label, pattern in AUTO_TAG_CATEGORIES.items():
+            re.compile(pattern, re.IGNORECASE)
+
+    def test_mode_group_tags(self):
+        from services.auto_tag_service import MODE_TAGS
+        assert "HIGH" in MODE_TAGS
+        assert "LOW" in MODE_TAGS
+
+    def test_video_group_tags(self):
+        from services.auto_tag_service import VIDEO_MODE_TAGS
+        assert "I2V" in VIDEO_MODE_TAGS
+        assert "T2V" in VIDEO_MODE_TAGS
+        assert "TI2V" in VIDEO_MODE_TAGS
+
+    def test_default_enabled_groups(self):
+        from services.auto_tag_service import DEFAULT_ENABLED_GROUPS
+        assert "mode" in DEFAULT_ENABLED_GROUPS
+        assert "video" in DEFAULT_ENABLED_GROUPS
+        assert "speed" not in DEFAULT_ENABLED_GROUPS