feat: add Gemini text-embedding-004 model (#122)

- Add Gemini text-embedding-004 as a new embedding model option
- Add rate limit error handling for embedding API calls
- Update model names to include provider prefix for clarity

README.md

@@ -82,6 +82,7 @@ Note: The Apply Edit feature is currently slower than desired. We are working on
 5. Set up your API key in plugin settings
    - OpenAI : [ChatGPT API Keys](https://platform.openai.com/api-keys)
    - Anthropic : [Claude API Keys](https://console.anthropic.com/settings/keys)
+   - Gemini : [Gemini API Keys](https://aistudio.google.com/apikey)
    - Groq : [Groq API Keys](https://console.groq.com/keys)
 
 **📚 For detailed setup instructions and documentation, please visit our [Documentation](https://github.com/glowingjade/obsidian-smart-composer/wiki).**

drizzle/0007_create_vector_data_gemini_text_embedding_004.sql

@@ -0,0 +1,10 @@
+CREATE TABLE IF NOT EXISTS "vector_data_gemini_text_embedding_004" (
+	"id" serial PRIMARY KEY NOT NULL,
+	"path" text NOT NULL,
+	"mtime" bigint NOT NULL,
+	"content" text NOT NULL,
+	"embedding" vector(768),
+	"metadata" jsonb NOT NULL
+);
+--> statement-breakpoint
+CREATE INDEX IF NOT EXISTS "embeddingIndex_gemini_text_embedding_004" ON "vector_data_gemini_text_embedding_004" USING hnsw ("embedding" vector_cosine_ops);