feat: US-010 - Extinde /voice doctor cu health-check pocket-tts

- adaugă ping GET /health la pocket-tts (URL din config tts.pockettts_url)
- adaugă verificare prezență hf_token în keyring
- checks-urile existente (libopus, voice load error) rămân neschimbate

gates rulate: tests PASS (1043 passed, 22 preexistente neschimbate), /review (backend) manual PASS

src/adapters/discord_voice.py

@@ -26,6 +26,7 @@ from pathlib import Path
 from typing import Optional
 
 import discord
+import httpx
 from discord import app_commands
 
 # Optional DAVE dep (mandatory at runtime when discord.py 2.7.1 is paired with
@@ -530,6 +531,23 @@ def register(tree: app_commands.CommandTree, bot: discord.Client) -> app_command
             checks.append(("libopus", False))
         # warmup
         checks.append(("voice load error", _voice_load_error is None))
+        # hf_token în keyring
+        try:
+            from src.credential_store import get_secret
+
+            checks.append(("hf_token (keyring)", get_secret("hf_token") is not None))
+        except Exception:
+            checks.append(("hf_token (keyring)", False))
+        # pocket-tts /health
+        pockettts_ok = False
+        try:
+            pockettts_url = Config().get("tts.pockettts_url", "http://127.0.0.1:7789")
+            async with httpx.AsyncClient(timeout=3.0) as client:
+                resp = await client.get(f"{pockettts_url}/health")
+                pockettts_ok = resp.status_code == 200
+        except Exception:
+            pockettts_ok = False
+        checks.append(("pocket-tts /health", pockettts_ok))
         # Build response
         lines = ["**Voice doctor:**"]
         for label, ok in checks: