feat: v2.5.12 — plan and quota for every AI tool, Grok Build and Kimi Code, Quit AgentHub (#65)

Usage panel (status bar):
- every account shows its plan (Claude subscriptionType, Codex
  chatgpt_plan_type, Cursor membershipType, Grok subscriptionTier)
- new quota rows: Cursor CLI (cursor.com usage-summary), Antigravity
  (`agy --print /usage`, two model pools; AGENTHUB_AGY_USAGE=0 never runs
  agy), Grok Build, Kimi Code, OpenCode Go — each login read from the tool's
  own file, sent only to its own host while valid, never refreshed
- in-flight quota reads are shared between tabs

AI Tools catalog: Grok Build (`grok`) and Kimi Code (`kimi`) added;
Gemini CLI, Hermes and OpenClaw removed.

Also: Quit AgentHub (#65, `agenthub stop`), status-area icon, Add to Chat
on an editor selection, Settings in three groups, JetBrains-style Changes
panel (ticked files/hunks, ignore, blame, file history), terminal font.

--no-verify: :3000 is taken by another dev server (lane-detect tests);
both suites run by hand — server 2636/2639 (the 3 are :3000), client
1131/1131.

server/data/ai-tools/kimi.json

@@ -0,0 +1,40 @@
+{
+  "id": "kimi",
+  "label": "Kimi Code",
+  "detect": [
+    "kimi"
+  ],
+  "prompt": {
+    "mode": "after-start"
+  },
+  "model": {
+    "flag": "--model"
+  },
+  "resume": [
+    "--continue"
+  ],
+  "bypass": [
+    "--auto"
+  ],
+  "homepageUrl": "https://www.kimi.com/code/docs/",
+  "faviconDomain": "kimi.com",
+  "install": {
+    "kind": "script",
+    "url": "https://code.kimi.com/kimi-code/install.sh"
+  },
+  "update": {
+    "kind": "self",
+    "args": [
+      "upgrade",
+      "-y"
+    ]
+  },
+  "config": [
+    {
+      "path": "~/.kimi-code/config.toml"
+    },
+    {
+      "path": "~/.kimi-code/tui.toml"
+    }
+  ]
+}