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.

tests/translator/bugs-gemini-cursor-commandcode.test.js

@@ -62,15 +62,18 @@ describe("OpenAI → CommandCode", () => {
     expect(Object.keys(call.input).length, "arguments silently dropped to {}").toBeGreaterThan(0);
   });
 
-  // openai-to-commandcode.js:41-42 — image becomes "[image omitted]"
-  // KNOWN BUG
-  it.fails("image content is preserved", () => {
+  it("image content is preserved as native CommandCode image blocks", () => {
     const out = O2CC({
       messages: [{ role: "user", content: [
         { type: "text", text: "look" },
         { type: "image_url", image_url: { url: "data:image/png;base64,BBBB" } },
       ] }],
     });
-    expect(JSON.stringify(out), "image omitted").toContain("BBBB");
+    expect(JSON.stringify(out)).toContain("BBBB");
+    expect(JSON.stringify(out)).not.toContain("[image omitted]");
+    expect(out.params.messages[0].content).toEqual([
+      { type: "text", text: "look" },
+      { type: "image", image: "data:image/png;base64,BBBB", mimeType: "image/png" },
+    ]);
   });
 });