feat: complete MiniMax LLM provider integration

Add full MiniMax provider support across the entire stack:

Backend:
- Add MINIMAX to LiteLLMProvider enum in db.py
- Add MINIMAX mapping to all provider_map dicts in llm_service.py,
  llm_router_service.py, and llm_config.py
- Add Alembic migration (rev 106) for PostgreSQL enum
- Add MiniMax M2.5 example in global_llm_config.example.yaml

Frontend:
- Add MiniMax to LLM_PROVIDERS enum with apiBase
- Add MiniMax-M2.5 and MiniMax-M2.5-highspeed to LLM_MODELS
- Add MINIMAX to Zod validation schema
- Add MiniMax SVG icon and wire up in provider-icons

Docs:
- Add MiniMax setup guide in chinese-llm-setup.md

MiniMax uses an OpenAI-compatible API (https://api.minimax.io/v1)
with models supporting up to 204K context window.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

surfsense_web/contracts/enums/llm-models.ts

@@ -1525,6 +1525,20 @@ export const LLM_MODELS: LLMModel[] = [
 		provider: "GITHUB_MODELS",
 		contextWindow: "64K",
 	},
+
+	// MiniMax
+	{
+		value: "MiniMax-M2.5",
+		label: "MiniMax M2.5",
+		provider: "MINIMAX",
+		contextWindow: "204K",
+	},
+	{
+		value: "MiniMax-M2.5-highspeed",
+		label: "MiniMax M2.5 Highspeed",
+		provider: "MINIMAX",
+		contextWindow: "204K",
+	},
 ];
 
 // Helper function to get models by provider

surfsense_web/contracts/enums/llm-providers.ts

@@ -181,6 +181,13 @@ export const LLM_PROVIDERS: LLMProvider[] = [
 		description: "AI models from GitHub Marketplace",
 		apiBase: "https://models.github.ai/inference",
 	},
+	{
+		value: "MINIMAX",
+		label: "MiniMax",
+		example: "MiniMax-M2.5, MiniMax-M2.5-highspeed",
+		description: "High-performance models with 204K context",
+		apiBase: "https://api.minimax.io/v1",
+	},
 	{
 		value: "CUSTOM",
 		label: "Custom Provider",

surfsense_web/contracts/types/new-llm-config.types.ts

@@ -34,6 +34,7 @@ export const liteLLMProviderEnum = z.enum([
 	"COMETAPI",
 	"HUGGINGFACE",
 	"GITHUB_MODELS",
+	"MINIMAX",
 	"CUSTOM",
 ]);