refactor(ml): drop dead tagger/suggestion settings + columns (#1199)

Hygiene follow-up to the Camie retirement (#1189) — these were left inert to
bound that change; nothing reads them now. Migration 0068 drops:
- ml_settings: tagger_store_floor, tagger_model_version, suggestion_threshold_
  character/general (already dead pre-retirement — scoring uses per-head
  thresholds), video_min_tag_frames (only the deleted video-prediction
  aggregator used it).
- image_record: tagger_model_version (no writer), centroid_scores (dead JSON
  cache, no reader).

Also: ml_admin _EDITABLE/GET/_validate pruned (dropped the store-floor invariant
+ video_min_tag_frames check); MLThresholdSliders trimmed to a video-embedding
card (interval + max frames only); importer no longer resets the dropped cols;
download_models drops the Camie fetch; stale CASCADE comments in cleanup_service
no longer name the removed tables. Tests updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa

frontend/src/components/settings/MLThresholdSliders.vue

@@ -1,69 +1,30 @@
 <template>
   <MaintenanceTile
-    icon="mdi-tune"
-    title="Suggestion thresholds"
-    blurb="Confidence cutoffs that gate auto-suggested tags + video sampling."
+    icon="mdi-filmstrip"
+    title="Video embedding"
+    blurb="How videos are sampled into frames before embedding."
   >
     <div v-if="store.settings">
-      <v-row v-for="f in fields" :key="f.key">
-        <v-col cols="12">
-          <v-slider
-            v-model="local[f.key]" :label="f.label"
-            :min="f.floorMin ? local.tagger_store_floor : 0" max="1" step="0.05"
-            thumb-label hide-details
-            color="accent" @end="save"
-          />
-        </v-col>
-      </v-row>
-
-      <v-divider class="my-4" />
-
-      <v-row>
-        <v-col cols="12">
-          <v-slider
-            v-model="local.tagger_store_floor" label="Tagger store floor"
-            min="0" max="1" step="0.05" thumb-label hide-details
-            color="accent" @end="save"
-          />
-          <div class="text-caption fc-muted mt-1">
-            Tagger predictions below this confidence aren't stored — raising it
-            keeps the image library lean. Suggestions can't be shown below the
-            floor.
-          </div>
-        </v-col>
-      </v-row>
-
-      <v-divider class="my-4" />
-
-      <div class="text-subtitle-2 mb-1">Video tagging</div>
       <div class="text-caption fc-muted mb-3">
-        Videos are tagged by sampling frames at a fixed cadence. A tag is kept
-        only if it shows up in enough frames (≈ that many × the interval in
-        seconds of screen time), which filters one-frame noise without losing
-        tags that only appear in part of a longer video.
+        Videos are embedded by sampling frames at a fixed cadence and mean-pooling
+        their SigLIP embeddings. The interval sets the cadence; the cap bounds how
+        many frames a long video samples.
       </div>
       <v-row>
-        <v-col cols="12" sm="4">
+        <v-col cols="12" sm="6">
           <v-text-field
             v-model.number="local.video_frame_interval_seconds"
             label="Frame interval (s)" type="number" min="0.5" step="0.5"
             density="comfortable" hide-details @change="save"
           />
         </v-col>
-        <v-col cols="12" sm="4">
+        <v-col cols="12" sm="6">
           <v-text-field
             v-model.number="local.video_max_frames"
             label="Max frames" type="number" min="1" step="1"
             density="comfortable" hide-details @change="save"
           />
         </v-col>
-        <v-col cols="12" sm="4">
-          <v-text-field
-            v-model.number="local.video_min_tag_frames"
-            label="Min frames per tag" type="number" min="1" step="1"
-            density="comfortable" hide-details @change="save"
-          />
-        </v-col>
       </v-row>
     </div>
     <div v-else><v-skeleton-loader type="paragraph" /></div>
@@ -77,31 +38,14 @@ import { useMLStore } from '../../stores/ml.js'
 import MaintenanceTile from '../common/MaintenanceTile.vue'
 
 const store = useMLStore()
-// 'artist' (FC-2d-vii-c) and 'copyright' (2026-06-01) retired as
-// suggestion categories; their threshold rows are gone.
-// floorMin: the per-category suggestion thresholds can't drop below the
-// tagger store floor (nothing below the floor is stored to surface).
-const fields = [
-  { key: 'suggestion_threshold_character', label: 'Character', floorMin: true },
-  { key: 'suggestion_threshold_general', label: 'General', floorMin: true }
-]
 const local = reactive({})
 watch(() => store.settings, (s) => { if (s) Object.assign(local, s) }, { immediate: true })
 
 async function save() {
-  // Mirror the server invariant: keep the category thresholds at or above the
-  // store floor so a raised floor doesn't leave a threshold stranded below it.
-  const floor = local.tagger_store_floor
-  local.suggestion_threshold_character = Math.max(local.suggestion_threshold_character, floor)
-  local.suggestion_threshold_general = Math.max(local.suggestion_threshold_general, floor)
-  // Mirror the server invariant: a tag can't require more frames than are sampled.
-  local.video_min_tag_frames = Math.min(local.video_min_tag_frames, local.video_max_frames)
-  const patch = {}
-  for (const f of fields) patch[f.key] = local[f.key]
-  patch.tagger_store_floor = local.tagger_store_floor
-  patch.video_frame_interval_seconds = local.video_frame_interval_seconds
-  patch.video_max_frames = local.video_max_frames
-  patch.video_min_tag_frames = local.video_min_tag_frames
+  const patch = {
+    video_frame_interval_seconds: local.video_frame_interval_seconds,
+    video_max_frames: local.video_max_frames
+  }
   try { await store.patchSettings(patch) }
   catch (e) { toast({ text: e.message, type: 'error' }) }
 }