fix: embedding URL path missing /v1 prefix

The embedding endpoint path was  but OpenAI-compatible APIs
serve embeddings at . When EMBEDDING_BASE_URL is set to a
bare host (e.g. https://llm.aviron.ai), the resulting URL would be
/eembeddings instead of /v1/embeddings, returning 404.

Changed defaultBaseURL to not include /v1 and always use /v1/embeddings
as the endpoint path.

.env.example

@@ -3,7 +3,7 @@ QDRANT_PORT=6334
 # QDRANT_API_KEY=
 # QDRANT_TLS=false
 OPENAI_API_KEY=sk-...
-# EMBEDDING_BASE_URL=https://api.openai.com/v1
+# EMBEDDING_BASE_URL=https://api.openai.com
 EMBEDDING_MODEL=text-embedding-3-small
 MCP_TOKEN=change-me
 PORT=8080

embed.go

@@ -12,7 +12,7 @@ import (
 )
 
 const defaultModel = "text-embedding-3-small"
-const defaultBaseURL = "https://api.openai.com/v1"
+const defaultBaseURL = "https://api.openai.com"
 
 type embedder struct {
 	apiKey     string
@@ -61,7 +61,7 @@ func (e *embedder) embedText(ctx context.Context, text string) ([]float32, error
 		return nil, fmt.Errorf("marshal embedding request: %w", err)
 	}
 
-	req, err := http.NewRequestWithContext(ctx, http.MethodPost, e.baseURL+"/embeddings", bytes.NewReader(body))
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, e.baseURL+"/v1/embeddings", bytes.NewReader(body))
 	if err != nil {
 		return nil, fmt.Errorf("create embedding request: %w", err)
 	}

flake.nix

@@ -77,8 +77,8 @@
 
             embeddingBaseUrl = lib.mkOption {
               type = lib.types.str;
-              default = "https://api.openai.com/v1";
+              default = "https://api.openai.com";
-              description = "Base URL for the embeddings API.";
+              description = "Base URL for the embeddings API. Do not include /v1 suffix; it is appended automatically.";
             };
 
             embeddingModel = lib.mkOption {