Fix lazy audio path resolution for GPU streaming

Audio playback path was being resolved during parsing when database
may not be ready, causing fallback to non-existent path. Now resolves
lazily when stream starts, matching how audio analyzer works.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

streaming/stream_sexp_generic.py

@@ -928,7 +928,18 @@ class StreamInterpreter:
         ctx = Context(fps=fps)
 
         # Output (with optional audio sync)
+        # Resolve audio path lazily here if it wasn't resolved during parsing
         audio = self.audio_playback
+        if audio and not Path(audio).exists():
+            # Try to resolve as friendly name (may have failed during parsing)
+            audio_name = Path(audio).name  # Get just the name part
+            resolved = self._resolve_name(audio_name)
+            if resolved and resolved.exists():
+                audio = str(resolved)
+                print(f"Lazy resolved audio: {audio}", file=sys.stderr)
+            else:
+                print(f"WARNING: Audio file not found: {audio}", file=sys.stderr)
+                audio = None
         if output == "pipe":
             out = PipeOutput(size=(w, h), fps=fps, audio_source=audio)
         elif output == "preview":