fix(tools): scope Claude tool type defaulting to gateways that need it (#3905)

defaultClaudeToolType() stamped tools[].type = "custom" onto every
Claude-format request carrying tools since e08ac6da. That satisfied
MiniMax (error 2013) but broke Anthropic-compatible endpoints that only
accept the legacy typeless tool shape. DeepSeek's endpoint
(api.deepseek.com/anthropic/v1/messages) whitelists its tool `type` enum
to the web_search_* variants and answers HTTP 400 "unknown variant
`custom`", so every Claude Code request routed to a DeepSeek connection
failed and surfaced as a persistent 503.

Run the defaulting only when the target provider declares the new
requireClaudeToolType quirk (MiniMax, MiniMax-CN). Add
shouldDefaultClaudeToolType(provider, finalFormat, tools, PROVIDERS) in
translator/concerns/toolCall.js so the gate is unit-testable, and cover
MiniMax keeping the explicit type, DeepSeek/Anthropic staying typeless,
non-Claude formats and tool-less requests never defaulting.

Effectively a no-op for MiniMax and a restore of the pre-e08ac6da
behaviour everywhere else. Another strict gateway now only needs the same
one-line quirk instead of a global behavioural change.

open-sse/providers/registry/minimax-cn.js

@@ -22,6 +22,7 @@ export default {
     headers: { ...CLAUDE_API_HEADERS },
     quirks: {
       dropOutputConfig: true,
+      requireClaudeToolType: true,
     },
     reasoningInject: {
       scope: "all",

open-sse/providers/registry/minimax.js

@@ -22,6 +22,7 @@ export default {
     headers: { ...CLAUDE_API_HEADERS },
     quirks: {
       dropOutputConfig: true,
+      requireClaudeToolType: true,
     },
     reasoningInject: {
       scope: "all",