chore: update Gemini SDK to new genai library and add TTS audio output support

## CHANGES

- Replace deprecated generative-ai-go with google.golang.org/genai library
- Add TTS model detection and audio output validation
- Implement WAV file generation for TTS audio responses
- Add audio format checking utilities in CLI output
- Update Gemini client to support streaming with new SDK
- Add "Kore" and "subchunk" to VSCode spell checker dictionary
- Remove extra blank line from changelog formatting
- Update dependency imports and remove unused packages

go.mod

@@ -15,7 +15,6 @@ require (
 	github.com/gin-gonic/gin v1.10.1
 	github.com/go-git/go-git/v5 v5.16.2
 	github.com/go-shiori/go-readability v0.0.0-20250217085726-9f5bf5ca7612
-	github.com/google/generative-ai-go v0.20.1
 	github.com/google/go-github/v66 v66.0.0
 	github.com/hasura/go-graphql-client v0.14.4
 	github.com/jessevdk/go-flags v1.6.1
@@ -35,13 +34,16 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 )
 
+require (
+	github.com/google/go-cmp v0.7.0 // indirect
+	github.com/gorilla/websocket v1.5.3 // indirect
+)
+
 require (
 	cloud.google.com/go v0.121.2 // indirect
-	cloud.google.com/go/ai v0.12.1 // indirect
 	cloud.google.com/go/auth v0.16.2 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
 	cloud.google.com/go/compute/metadata v0.7.0 // indirect
-	cloud.google.com/go/longrunning v0.6.7 // indirect
 	dario.cat/mergo v1.0.2 // indirect
 	github.com/Microsoft/go-winio v0.6.2 // indirect
 	github.com/ProtonMail/go-crypto v1.3.0 // indirect
@@ -109,7 +111,6 @@ require (
 	github.com/ugorji/go/codec v1.2.14 // indirect
 	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.61.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.61.0 // indirect
 	go.opentelemetry.io/otel v1.36.0 // indirect
 	go.opentelemetry.io/otel/metric v1.36.0 // indirect
@@ -120,7 +121,7 @@ require (
 	golang.org/x/net v0.41.0 // indirect
 	golang.org/x/sync v0.16.0 // indirect
 	golang.org/x/sys v0.34.0 // indirect
-	golang.org/x/time v0.12.0 // indirect
+	google.golang.org/genai v1.17.0
 	google.golang.org/genproto/googleapis/api v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250603155806-513f23925822 // indirect
 	google.golang.org/grpc v1.73.0 // indirect