fix: TKG stats API returning 0 - count_by_type used wrong column

- tkg_nodes has no edge_type column, query was failing silently
- Split into count_nodes(node_type) and count_edges(edge_type)
- Fixed text_region → text_trace node type name
- Also: OCR frame fix in rule1 (end_frame computed from end_time+FPS)

src/core/chunk/rule1_ingest.rs

@@ -13,7 +13,7 @@ pub async fn execute_rule1(db: &PostgresDb, file_uuid: &str, fps: f64) -> Result
     let pool = db.pool();
     let pre_chunks_table = schema::table_name("pre_chunks");
 
-    let asr_segments = fetch_asr_segments(pool, file_uuid, &pre_chunks_table).await?;
+    let asr_segments = fetch_asr_segments(pool, file_uuid, &pre_chunks_table, fps).await?;
     let ocr_map = fetch_ocr_texts(pool, file_uuid, &pre_chunks_table).await?;
 
     let video = db
@@ -97,6 +97,7 @@ async fn fetch_asr_segments(
     pool: &PgPool,
     file_uuid: &str,
     table: &str,
+    fps: f64,
 ) -> Result<Vec<AsrSegment>> {
     let query = format!(
         r#"
@@ -114,8 +115,6 @@ async fn fetch_asr_segments(
     let segments: Vec<AsrSegment> = rows
         .iter()
         .map(|row| {
-            let start_frame: i64 = row.try_get("start_frame").unwrap_or(0);
-            let end_frame: i64 = row.try_get("end_frame").unwrap_or(0);
             let start_time: f64 = row.try_get("start_time").unwrap_or(0.0);
             let end_time_raw: Option<f64> = row.try_get("end_time").ok();
             let data: Value = row.try_get("data").unwrap_or(Value::Null);
@@ -124,6 +123,13 @@ async fn fetch_asr_segments(
                 .or_else(|| data.get("end_time").and_then(|v| v.as_f64()))
                 .unwrap_or(0.0);
 
+            let start_frame = (start_time * fps) as i64;
+            let end_frame = if end_time > 0.0 {
+                (end_time * fps) as i64
+            } else {
+                start_frame
+            };
+
             if end_time <= 0.0 {
                 warn!(
                     "ASR segment end_time is 0.0 for file {} (frame {}..{})",