fix: frame_number is BIGINT in DB, use i64 not i32

frame_number column in face_detections table is defined as BIGINT (INT8).
Using i32 caused sqlx type mismatch at runtime. Fixed in:
- identity_agent_api.rs: query_as tuples and HashMap key
- qdrant_db.rs: upsert_face_embedding signature and row extraction

src/api/identity_agent_api.rs

@@ -274,7 +274,7 @@ async fn match_from_trace(
     // 1. Get 3 best face embeddings from this trace at different angles
     //    Divide trace frame range into 3 segments, pick best face from each
     let fd_table = schema::table_name("face_detections");
-    let all_faces: Vec<(Vec<f32>, i32)> = sqlx::query_as::<_, (Vec<f32>, i32)>(&format!(
+    let all_faces: Vec<(Vec<f32>, i64)> = sqlx::query_as::<_, (Vec<f32>, i64)>(&format!(
         "SELECT embedding, frame_number FROM {} \
              WHERE file_uuid = $1 AND trace_id = $2 AND embedding IS NOT NULL \
              ORDER BY frame_number ASC",
@@ -311,7 +311,7 @@ async fn match_from_trace(
     let mut query_embeddings: Vec<Vec<f32>> = Vec::new();
 
     // Get width*height info if available (not all pipelines store it)
-    let face_sizes: Vec<(i32, i32)> = sqlx::query_as::<_, (i32, i32)>(&format!(
+    let face_sizes: Vec<(i64, i32)> = sqlx::query_as::<_, (i64, i32)>(&format!(
         "SELECT frame_number, COALESCE(width, 0) * COALESCE(height, 0) AS area \
              FROM {} WHERE file_uuid = $1 AND trace_id = $2 AND embedding IS NOT NULL \
              ORDER BY frame_number ASC",
@@ -323,7 +323,7 @@ async fn match_from_trace(
     .await
     .unwrap_or_default();
 
-    let face_sizes_map: std::collections::HashMap<i32, i32> = face_sizes.into_iter().collect();
+    let face_sizes_map: std::collections::HashMap<i64, i32> = face_sizes.into_iter().collect();
 
     for (start, end) in segments {
         let seg_start = start.min(total - 1);

src/core/db/qdrant_db.rs

@@ -758,7 +758,7 @@ impl QdrantDb {
         vector: &[f32],
         file_uuid: &str,
         trace_id: i32,
-        frame_number: i32,
+        frame_number: i64,
     ) -> Result<()> {
         let url = format!(
             "{}/collections/{}/points?wait=true",
@@ -889,7 +889,7 @@ pub async fn sync_face_embeddings(file_uuid: &str) -> Result<()> {
     for row in &rows {
         let id: i32 = row.get(0);
         let trace_id: Option<i32> = row.get(1);
-        let frame_number: i32 = row.get(2);
+        let frame_number: i64 = row.get(2);
         let embedding: Option<Vec<f32>> = row.get(3);
 
         if let (Some(emb), Some(tid)) = (embedding, trace_id) {