fix(commandcode): preserve images and reasoning_effort on /alpha/generate

Command Code dropped vision and ignored client effort through the router:
image blocks became "[image omitted]", HTTP image URLs were never inlined,
and reasoning_effort landed on the envelope wrapper instead of params (so the
DeepSeek family mapping remapped low -> high). The catalog also treated
deepseek/deepseek-v4.1-flash as text-only, so the vision adapter stole those
requests to another provider.

- Map OpenAI image_url / Claude image blocks (base64 or data-URI) to the
  native {type:"image", image:"data:...;base64,...", mimeType} generate block.
- Add FORMATS.COMMANDCODE to TARGETS_NEED_BASE64 so remote http(s) images are
  inlined by the existing SSRF-safe fetcher before translation.
- Write reasoning_effort inside params for targetFormat commandcode and pass
  low|medium|high|xhigh|max through unmapped; allow it in thinkingLevels.
- Provider-scoped capabilities for commandcode/cmc: vision except the CLI
  text-only denylist, thinkingFormat commandcode, so family patterns
  (deepseek-v4 -> thinkingFormat deepseek, vision false) no longer win.
- Quota Tracker: whoami + billing credits/subscriptions (credits vs plan cap,
  5h and weekly windows), labels from AI_PROVIDERS[].name.

open-sse/services/usage.js

@@ -20,6 +20,7 @@ import { getZedUsage } from "./usage/zed.js";
 import { getXiaomiMimoUsage } from "./usage/xiaomi-mimo.js";
 import { resolveQoderCredentials } from "./qoderModels.js";
 import { getGlmUsage } from "./usage/glm.js";
+import { getCommandCodeUsage } from "./usage/commandcode.js";
 import {
   getIflowUsage,
   getOllamaUsage,
@@ -62,6 +63,7 @@ const USAGE_HANDLERS = {
   groq: (c) => getGroqUsage(c.apiKey, c.proxyOptions),
   zed: (c) => getZedUsage(c.accessToken, c.providerSpecificData, c.proxyOptions),
   "xiaomi-mimo": (c) => getXiaomiMimoUsage(c.accessToken, c.providerSpecificData, c.proxyOptions),
+  commandcode: (c) => getCommandCodeUsage(c.apiKey, c.proxyOptions),
 };
 
 export async function getUsageForProvider(connection, proxyOptions = null, options = {}) {