Bump version to 1.3.0

TTS feature release: /tts/speech + voice library endpoints (Chatterbox via
llama-swap), input cleaning, tuning knobs, WAV-normalized voice cloning,
OTel spans, dedicated synth timeout, and single-flight serialization.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -2051,7 +2051,7 @@ dependencies = [
 
 [[package]]
 name = "image-api"
-version = "1.2.0"
+version = "1.3.0"
 dependencies = [
  "actix",
  "actix-cors",