fix(provider): replace retired gemini-embedding-exp-03-07 default with gemini-embedding-001 (#10393)

The Gemini Embedding provider ships enabled by default with
gemini-embedding-exp-03-07 as both the config default and the
source-level fallback. Google retired that experimental model when
gemini-embedding-001 went GA, so a fresh deployment that enables the
provider fails on its first request.

gemini-embedding-001 keeps the configured output_dimensionality path
intact: it supports MRL, so the default 768 dimensions still hold.

Ref #10317

astrbot/core/config/default.py

@@ -1995,7 +1995,7 @@ CONFIG_METADATA_2 = {
                         "enable": True,
                         "embedding_api_key": "",
                         "embedding_api_base": "",
-                        "embedding_model": "gemini-embedding-exp-03-07",
+                        "embedding_model": "gemini-embedding-001",
                         "embedding_dimensions": 768,
                         "timeout": 20,
                         "proxy": "",

astrbot/core/provider/sources/gemini_embedding_source.py

@@ -41,7 +41,7 @@ class GeminiEmbeddingProvider(EmbeddingProvider):
 
         self.model = provider_config.get(
             "embedding_model",
-            "gemini-embedding-exp-03-07",
+            "gemini-embedding-001",
         )
 
     async def get_embedding(self, text: str) -> list[float]: