feat: add gobreaker circuit breakers for OpenAI and Gemini API calls

Introduce internal/apicircuit with sony/gobreaker: trip after five
consecutive failures, 45s open state, 2m count reset, half-open trial cap.
context.Canceled is not counted as a failure for breaker stats.

Wrap OpenAI TTS, Gemini TTS, OpenAI DALL-E/chat (image path), and Nano Banana
Gemini GenerateContent calls. HTTP timeouts remain unchanged in httpctx.

Made-with: Cursor

2 files changed, 28 insertions, 16 deletions

diff --git a/internal/image/nanobanana.go b/internal/image/nanobanana.go
index 7694069..4d12d08 100644
--- a/internal/image/nanobanana.go
+++ b/internal/image/nanobanana.go
@@ -17,6 +17,7 @@ import (
 
 	"google.golang.org/genai"
 
+	"codeberg.org/snonux/totalrecall/internal/apicircuit"
 	"codeberg.org/snonux/totalrecall/internal/config"
 	"codeberg.org/snonux/totalrecall/internal/httpctx"
 )
@@ -382,12 +383,14 @@ func (c *NanoBananaClient) generateSceneDescription(ctx context.Context, bulgari
 
 func (c *NanoBananaClient) generateText(ctx context.Context, model, systemPrompt, userPrompt string, temperature float32, maxOutputTokens int32) (string, error) {
 	temp := temperature
-	resp, err := c.client.Models.GenerateContent(ctx, model, []*genai.Content{
-		genai.NewContentFromText(userPrompt, genai.RoleUser),
-	}, &genai.GenerateContentConfig{
-		SystemInstruction: genai.NewContentFromText(systemPrompt, genai.RoleUser),
-		Temperature:       &temp,
-		MaxOutputTokens:   maxOutputTokens,
+	resp, err := apicircuit.GeminiNanoBanana(func() (*genai.GenerateContentResponse, error) {
+		return c.client.Models.GenerateContent(ctx, model, []*genai.Content{
+			genai.NewContentFromText(userPrompt, genai.RoleUser),
+		}, &genai.GenerateContentConfig{
+			SystemInstruction: genai.NewContentFromText(systemPrompt, genai.RoleUser),
+			Temperature:       &temp,
+			MaxOutputTokens:   maxOutputTokens,
+		})
 	})
 	if err != nil {
 		return "", fmt.Errorf("gemini API error: %w", err)
@@ -412,9 +415,11 @@ func (c *NanoBananaClient) generateImage(ctx context.Context, prompt, aspectRati
 		},
 	}
 
-	resp, err := c.client.Models.GenerateContent(ctx, c.modelName(), []*genai.Content{
-		genai.NewContentFromText(prompt, genai.RoleUser),
-	}, cfg)
+	resp, err := apicircuit.GeminiNanoBanana(func() (*genai.GenerateContentResponse, error) {
+		return c.client.Models.GenerateContent(ctx, c.modelName(), []*genai.Content{
+			genai.NewContentFromText(prompt, genai.RoleUser),
+		}, cfg)
+	})
 	if err != nil {
 		return nil, "", &SearchError{
 			Provider: nanoBananaSource,
@@ -466,10 +471,12 @@ func (c *NanoBananaClient) generateImageWithRefs(ctx context.Context, prompt, as
 	)
 	parts = append(parts, &genai.Part{Text: refNote + prompt})
 
-	resp, err := c.client.Models.GenerateContent(ctx, c.modelName(),
-		[]*genai.Content{{Role: string(genai.RoleUser), Parts: parts}},
-		cfg,
-	)
+	resp, err := apicircuit.GeminiNanoBanana(func() (*genai.GenerateContentResponse, error) {
+		return c.client.Models.GenerateContent(ctx, c.modelName(),
+			[]*genai.Content{{Role: string(genai.RoleUser), Parts: parts}},
+			cfg,
+		)
+	})
 	if err != nil {
 		return nil, "", &SearchError{
 			Provider: nanoBananaSource,
diff --git a/internal/image/openai.go b/internal/image/openai.go
index 9fb8148..1bd5b2d 100644
--- a/internal/image/openai.go
+++ b/internal/image/openai.go
@@ -12,6 +12,7 @@ import (
 
 	"github.com/sashabaranov/go-openai"
 
+	"codeberg.org/snonux/totalrecall/internal/apicircuit"
 	"codeberg.org/snonux/totalrecall/internal/httpctx"
 )
 
@@ -154,8 +155,10 @@ func (c *OpenAIClient) Search(ctx context.Context, opts *SearchOptions) ([]Searc
 		req.Style = c.style
 	}
 
-	// Generate the image
-	resp, err := c.client.CreateImage(ctx, req)
+	// Generate the image (circuit breaker limits load when OpenAI is unhealthy).
+	resp, err := apicircuit.OpenAIImage(func() (openai.ImageResponse, error) {
+		return c.client.CreateImage(ctx, req)
+	})
 	if err != nil {
 		return nil, &SearchError{
 			Provider: "openai",
@@ -295,7 +298,9 @@ func (c *OpenAIClient) generateSceneDescription(ctx context.Context, bulgarianWo
 		MaxTokens:   100,
 	}
 
-	resp, err := c.client.CreateChatCompletion(ctx, req)
+	resp, err := apicircuit.OpenAIImage(func() (openai.ChatCompletionResponse, error) {
+		return c.client.CreateChatCompletion(ctx, req)
+	})
 	if err != nil {
 		return "", fmt.Errorf("scene generation failed: %w", err)
 	}