refactor: extract hardcoded sats limit in grok L402 proxy

Replace hardcoded sats values with config.settings references:
- grok.py: use settings.grok_sats_hard_cap instead of literal 100
- cli.py: default --price to settings.grok_sats_hard_cap from config

Fixes #937

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/dashboard/routes/grok.py

@@ -125,7 +125,7 @@ def _run_grok_query(message: str) -> dict:
             from lightning.factory import get_backend as get_ln_backend
 
             ln = get_ln_backend()
-            sats = min(settings.grok_max_sats_per_query, 100)
+            sats = min(settings.grok_max_sats_per_query, settings.grok_sats_hard_cap)
             ln.create_invoice(sats, f"Grok: {message[:50]}")
             invoice_note = f" | {sats} sats"
         except Exception as exc:

src/timmy_serve/cli.py

@@ -14,10 +14,15 @@ app = typer.Typer(help="Timmy Serve — sovereign AI agent API")
 def start(
     port: int = typer.Option(8402, "--port", "-p", help="Port for the serve API"),
     host: str = typer.Option("0.0.0.0", "--host", "-h", help="Host to bind to"),
-    price: int = typer.Option(100, "--price", help="Price per request in sats"),
+    price: int = typer.Option(None, "--price", help="Price per request in sats (default: from config)"),
     dry_run: bool = typer.Option(False, "--dry-run", help="Print config and exit (for testing)"),
 ):
     """Start Timmy in serve mode."""
+    from config import settings
+
+    if price is None:
+        price = settings.grok_sats_hard_cap
+
     typer.echo(f"Starting Timmy Serve on {host}:{port}")
     typer.echo(f"L402 payment proxy active — {price} sats per request")
     typer.echo("Press Ctrl-C to stop")