Merge origin/master (v0.5.81) into gitea/new_feature

Resolve conflicts:
- streamingHandler.js: merge buildStreamErrorBytes onAbortTerminal + local shouldPersistRequestDetail & streamStatusForContent
- capabilities.js: preserve server-injected user-asserted caps and models.dev catalog lookup; wire CommandCode /alpha/generate caps inside resolve()
- commandcode.js (services/usage): adopt upstream whoami + billing credits/subscriptions with 5h/weekly rate windows and plan caps
- openai-to-commandcode.js: merge toNativeImageBlock (data-URI & http(s) support) and assistant reasoning_content preservation
- commandcode-to-openai.js: adopt upstream mid-stream error throw for clean retry and abortion
- tests: sync commandcode test suite and exclude .next from vitest config

open-sse/providers/thinkingLevels.js

@@ -26,6 +26,7 @@ const FORMAT_LEVELS = {
   qwen: L.base,
   kimi: L.levelMax,
   deepseek: L.hiMax,
+  commandcode: ["none", "low", "medium", "high", "xhigh", "max"],
   minimax: L.onOff,
   hunyuan: L.base,
   step: L.base,
@@ -40,6 +41,10 @@ const PATTERN_THINKING = [
   { provider: "codex", pattern: "*gpt-5.6-terra*", levels: [...CODEX_GPT_5_6_LEVELS, "ultra"] },
   { provider: "codex", pattern: "*gpt-5.6-luna*", levels: CODEX_GPT_5_6_LEVELS },
   { pattern: "*codex*", levels: ["low", "medium", "high", "xhigh"] }, // codex cannot disable thinking
+  // DeepSeek v4.* (Alibaba MaaS, probed live): effort low|medium|high|xhigh|max
+  // all 200 via output_config.effort; "none" is a 400 on the anthropic route
+  // (disable thinking instead). none kept for the picker = disable.
+  { pattern: "*deepseek-v4.*", levels: ["none", "low", "medium", "high", "xhigh", "max"] },
   // codebuddy-cn per-model effort sets — the server's product-config payload
   // publishes `reasoning.supportedEfforts` per model. NOTE: the chat endpoint
   // accepts any level you send (probed none/minimal/low/medium/high/xhigh/max
@@ -52,6 +57,8 @@ const PATTERN_THINKING = [
   { provider: "codebuddy-cn", pattern: "deepseek-v4*", levels: ["low", "high", "xhigh"] },
   { provider: "codebuddy-cn", pattern: "hy3*",         levels: ["low", "high"] },
   { provider: "codebuddy-cn", pattern: "hy4*",         levels: ["high"] },
+  // codebuddy-intl rides the same gateway catalog, so its deepseek levels match.
+  { provider: "codebuddy-intl", pattern: "deepseek-v4*", levels: ["low", "high", "xhigh"] },
 ];
 
 // The generic level set used when a model's thinking format is unknown. Exported