fix(installer): verbose diagnostics — show CLAUDE_CUSTOM_MODELS count

User reported: after install, claude /model picker shows only 5 models
(built-ins) instead of 19 — config DID land somewhere but CLAUDE_CUSTOM_
MODELS env block in settings.json was empty/missing.

Hard to debug without seeing user's settings.json. Add verbose diagnostic:

uclaude_updater.py patch_all_users():
- Pre-check: warn if config has 0 models OR placeholder api_key
- Post-patch per user: read back the JUST-WRITTEN settings.json, count
  CLAUDE_CUSTOM_MODELS entries, print:
    "Patched root: /root/.claude/settings.json (env.CLAUDE_CUSTOM_MODELS=19 models)"

uclaude_install.sh — final verification block:
- Show ANTHROPIC_BASE_URL + AUTH_TOKEN prefix + custom_models count
- Loud warning if 0 models or auth_token missing

Now user can immediately see "0 models" or "19 models" without manually
inspecting settings.json. If 0 — knows config fetch failed silently.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

claude/uclaude_updater.py

@@ -876,10 +876,31 @@ def patch_all_users(config):
         eprint(f"  {Y}No users found{D}")
         return
 
+    # Diagnostic: confirm config has the key fields BEFORE patching users.
+    # If models is empty/missing, claude shows only built-in defaults
+    # (user reported only 5 models in /model picker — root cause was here).
+    n_models = len(config.get("models", []))
+    if n_models == 0:
+        eprint(f"  {R}WARNING: config has 0 models — claude /model will show built-ins only{D}")
+    else:
+        print(f"  Config has {n_models} models (sample: {','.join(config['models'][:3])}...)")
+    if not config.get("api_key") or config["api_key"] in ("YOUR_API_KEY", "PLACEHOLDER", ""):
+        eprint(f"  {R}WARNING: api_key is placeholder/empty — claude API auth will fail{D}")
+
     for user in users:
         try:
             path = patch_user(user.home, user.name, user.uid, user.gid, config)
-            print(f"  {G}Patched {user.name}{D}: {path}")
+            # Verify what landed in settings.json
+            try:
+                with open(path, "r") as f:
+                    written = json.load(f)
+                env_block = written.get("env", {})
+                ccm = env_block.get("CLAUDE_CUSTOM_MODELS", "")
+                ccm_count = len(ccm.split(",")) if ccm else 0
+                print(f"  {G}Patched {user.name}{D}: {path} "
+                      f"(env.CLAUDE_CUSTOM_MODELS={ccm_count} models)")
+            except Exception:
+                print(f"  {G}Patched {user.name}{D}: {path}")
         except Exception as e:
             eprint(f"  {R}Failed to patch {user.name}: {e}{D}")