Restore Envato and Artgrid fallback search breadth

TODO.md

@@ -50,6 +50,20 @@
 - Improved result rendering:
   - search cards now show source snippet/description separately from AI reason to reduce confusion between asset metadata and Gemini commentary
 
+## Current Session Update (2026-03-13, Regression Fix)
+- A regression was found after search optimization:
+  - Envato and Artgrid disappeared entirely for some real searches while Google Video still returned results
+- Root cause:
+  - the first optimization reduced query-variant breadth too aggressively
+  - the first 3 query variants were not enough to recover Envato/Artgrid in some real SearXNG result sets
+- Fix applied:
+  - search now runs in two stages
+  - stage 1 searches only the first few variants for speed
+  - stage 2 searches additional variants only for sources that still returned zero results
+- Intent:
+  - keep the anti-timeout optimization
+  - recover Envato/Artgrid recall when the early pass is too narrow
+
 ## Local Self-Test Workflow
 - Primary command:
   - `bash scripts/selftest.sh`

backend/services/cse.go

@@ -92,8 +92,10 @@ func (s *SearchService) SearchMedia(queries []string, enabledPlatforms map[strin
 	results := make([]SearchResult, 0, 90)
 	var lastErr error
 
-	baseQueries := limitQueries(queries, 3)
-	for _, base := range baseQueries {
+	baseQueries := limitQueries(queries, 6)
+	primaryQueries := baseQueries[:minInt(len(baseQueries), 3)]
+	runSearchPass := func(bases []string, onlyMissing bool) {
+		for _, base := range bases {
 			base = strings.TrimSpace(base)
 			if base == "" {
 				continue
@@ -105,6 +107,9 @@ func (s *SearchService) SearchMedia(queries []string, enabledPlatforms map[strin
 				if sourceCounts[source.name] >= source.maxResults {
 					continue
 				}
+				if onlyMissing && sourceCounts[source.name] > 0 {
+					continue
+				}
 				for _, searchQuery := range source.build(base) {
 					if sourceCounts[source.name] >= source.maxResults {
 						break
@@ -132,6 +137,12 @@ func (s *SearchService) SearchMedia(queries []string, enabledPlatforms map[strin
 				}
 			}
 		}
+	}
+
+	runSearchPass(primaryQueries, false)
+	if len(baseQueries) > len(primaryQueries) {
+		runSearchPass(baseQueries[len(primaryQueries):], true)
+	}
 
 	if len(results) == 0 && lastErr != nil {
 		return nil, lastErr