fix(opencode-go): strip trailing /v1 from base URL for Anthropic models (#4918)

The Anthropic SDK appends /v1/messages to the base_url, so OpenCode's
base URL https://opencode.ai/zen/go/v1 produced a double /v1 path
(https://opencode.ai/zen/go/v1/v1/messages), causing 404s for MiniMax
models. Strip trailing /v1 when api_mode is anthropic_messages.

Also adds MiMo-V2-Pro, MiMo-V2-Omni, and MiniMax-M2.5 to the OpenCode
Go model lists per their updated docs.

Fixes #4890

hermes_cli/models.py

@@ -201,7 +201,10 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
     "opencode-go": [
         "glm-5",
         "kimi-k2.5",
+        "mimo-v2-pro",
+        "mimo-v2-omni",
         "minimax-m2.7",
+        "minimax-m2.5",
     ],
     "ai-gateway": [
         "anthropic/claude-opus-4.6",