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_backend/alembic/versions/106_add_minimax_to_litellmprovider_enum.py

@@ -0,0 +1,23 @@
+"""Add MINIMAX to LiteLLMProvider enum
+
+Revision ID: 106
+Revises: 105
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+revision: str = "106"
+down_revision: str | None = "105"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.execute("COMMIT")
+    op.execute("ALTER TYPE litellmprovider ADD VALUE IF NOT EXISTS 'MINIMAX'")
+
+
+def downgrade() -> None:
+    pass

surfsense_backend/app/agents/new_chat/llm_config.py

@@ -59,6 +59,7 @@ PROVIDER_MAP = {
     "DATABRICKS": "databricks",
     "COMETAPI": "cometapi",
     "HUGGINGFACE": "huggingface",
+    "MINIMAX": "openai",
     "CUSTOM": "custom",
 }
 

surfsense_backend/app/config/global_llm_config.example.yaml

@@ -183,6 +183,23 @@ global_llm_configs:
     use_default_system_instructions: true
     citations_enabled: true
 
+  # Example: MiniMax M2.5 - High-performance with 204K context window
+  - id: -8
+    name: "Global MiniMax M2.5"
+    description: "MiniMax M2.5 with 204K context window and competitive pricing"
+    provider: "MINIMAX"
+    model_name: "MiniMax-M2.5"
+    api_key: "your-minimax-api-key-here"
+    api_base: "https://api.minimax.io/v1"
+    rpm: 60
+    tpm: 100000
+    litellm_params:
+      temperature: 1.0  # MiniMax requires temperature in (0.0, 1.0], cannot be 0
+      max_tokens: 4000
+    system_instructions: ""
+    use_default_system_instructions: true
+    citations_enabled: true
+
 # =============================================================================
 # Image Generation Configuration
 # =============================================================================

surfsense_backend/app/db.py

@@ -215,6 +215,7 @@ class LiteLLMProvider(StrEnum):
     COMETAPI = "COMETAPI"
     HUGGINGFACE = "HUGGINGFACE"
     GITHUB_MODELS = "GITHUB_MODELS"
+    MINIMAX = "MINIMAX"
     CUSTOM = "CUSTOM"
 
 

surfsense_backend/app/services/llm_router_service.py

@@ -85,6 +85,7 @@ PROVIDER_MAP = {
     "ZHIPU": "openai",
     "GITHUB_MODELS": "github",
     "HUGGINGFACE": "huggingface",
+    "MINIMAX": "openai",
     "CUSTOM": "custom",
 }
 

surfsense_backend/app/services/llm_service.py

@@ -127,6 +127,7 @@ async def validate_llm_config(
                 "ALIBABA_QWEN": "openai",
                 "MOONSHOT": "openai",
                 "ZHIPU": "openai",  # GLM needs special handling
+                "MINIMAX": "openai",
                 "GITHUB_MODELS": "github",
             }
             provider_prefix = provider_map.get(provider, provider.lower())
@@ -277,6 +278,7 @@ async def get_search_space_llm_instance(
                     "ALIBABA_QWEN": "openai",
                     "MOONSHOT": "openai",
                     "ZHIPU": "openai",
+                "MINIMAX": "openai",
                 }
                 provider_prefix = provider_map.get(
                     global_config["provider"], global_config["provider"].lower()
@@ -350,6 +352,7 @@ async def get_search_space_llm_instance(
                 "ALIBABA_QWEN": "openai",
                 "MOONSHOT": "openai",
                 "ZHIPU": "openai",
+                "MINIMAX": "openai",
                 "GITHUB_MODELS": "github",
             }
             provider_prefix = provider_map.get(