Add support for multiple GenAI Providers (#22144)

* GenAI client manager

* Add config migration

* Convert to roles list

* Support getting client via manager

* Cleanup

* Fix import issues

* Set model in llama.cpp config

* Clenaup

* Use config update

* Clenaup

* Add new title and desc

frigate/genai/manager.py

@@ -0,0 +1,89 @@
+"""GenAI client manager for Frigate.
+
+Manages GenAI provider clients from Frigate config. Configuration is read only
+in _update_config(); no other code should read config.genai. Exposes clients
+by role: tool_client, vision_client, embeddings_client.
+"""
+
+import logging
+from typing import TYPE_CHECKING, Optional
+
+from frigate.config import FrigateConfig
+from frigate.config.camera.genai import GenAIRoleEnum
+
+if TYPE_CHECKING:
+    from frigate.genai import GenAIClient
+
+logger = logging.getLogger(__name__)
+
+
+class GenAIClientManager:
+    """Manages GenAI provider clients from Frigate config."""
+
+    def __init__(self, config: FrigateConfig) -> None:
+        self._config = config
+        self._tool_client: Optional[GenAIClient] = None
+        self._vision_client: Optional[GenAIClient] = None
+        self._embeddings_client: Optional[GenAIClient] = None
+        self._update_config()
+
+    def _update_config(self) -> None:
+        """Build role clients from current Frigate config.genai.
+
+        Called from __init__ and can be called again when config is reloaded.
+        Each role (tools, vision, embeddings) gets the client for the provider
+        that has that role in its roles list.
+        """
+        from frigate.genai import PROVIDERS, load_providers
+
+        self._tool_client = None
+        self._vision_client = None
+        self._embeddings_client = None
+
+        if not self._config.genai:
+            return
+
+        load_providers()
+
+        for _name, genai_cfg in self._config.genai.items():
+            if not genai_cfg.provider:
+                continue
+            provider_cls = PROVIDERS.get(genai_cfg.provider)
+            if not provider_cls:
+                logger.warning(
+                    "Unknown GenAI provider %s in config, skipping.",
+                    genai_cfg.provider,
+                )
+                continue
+            try:
+                client = provider_cls(genai_cfg)
+            except Exception as e:
+                logger.exception(
+                    "Failed to create GenAI client for provider %s: %s",
+                    genai_cfg.provider,
+                    e,
+                )
+                continue
+
+            for role in genai_cfg.roles:
+                if role == GenAIRoleEnum.tools:
+                    self._tool_client = client
+                elif role == GenAIRoleEnum.vision:
+                    self._vision_client = client
+                elif role == GenAIRoleEnum.embeddings:
+                    self._embeddings_client = client
+
+    @property
+    def tool_client(self) -> "Optional[GenAIClient]":
+        """Client configured for the tools role (e.g. chat with function calling)."""
+        return self._tool_client
+
+    @property
+    def vision_client(self) -> "Optional[GenAIClient]":
+        """Client configured for the vision role (e.g. review descriptions, object descriptions)."""
+        return self._vision_client
+
+    @property
+    def embeddings_client(self) -> "Optional[GenAIClient]":
+        """Client configured for the embeddings role."""
+        return self._embeddings_client