Refactor CLI and LLM runtime handling for improved user experience

- Removed deprecated console usage in favor of structured logging functions for error handling and user prompts.
- Enhanced CLI prompts for LLM runtime and preset selection, utilizing menu helpers for better user interaction.
- Updated GPU pool scanning output with improved formatting and error indication for clarity.
- Refactored setup wizard to streamline LLM runtime and preset configuration, ensuring a more intuitive setup process.
- Improved documentation and user feedback in CLI outputs to enhance overall usability.

src/gpu_rent/prompts.py

@@ -0,0 +1,72 @@
+"""Numbered interactive menus (Enter = default index)."""
+
+from __future__ import annotations
+
+from collections.abc import Callable, Sequence
+from dataclasses import dataclass
+
+from rich.markup import escape
+
+Ask = Callable[[str, str], str]
+Show = Callable[[str], None]
+
+
+@dataclass(frozen=True)
+class MenuItem:
+    key: str
+    label: str
+
+
+def resolve_menu_choice(
+    raw: str,
+    items: Sequence[MenuItem],
+    *,
+    default_key: str,
+) -> str:
+    """Accept 1-based index or exact key (case-insensitive). Empty → default."""
+    text = (raw or "").strip().lower()
+    if not text:
+        return default_key
+    if text.isdigit():
+        idx = int(text)
+        if 1 <= idx <= len(items):
+            return items[idx - 1].key
+        raise ValueError(f"выбор: жду 1…{len(items)}, получили {idx}")
+    for item in items:
+        if item.key.lower() == text:
+            return item.key
+    keys = ", ".join(f"{i}:{it.key}" for i, it in enumerate(items, 1))
+    raise ValueError(f"выбор: жду номер или ключ ({keys}), получили {raw!r}")
+
+
+def prompt_menu(
+    title: str,
+    items: Sequence[MenuItem],
+    *,
+    default: str,
+    ask: Ask,
+    show: Show | None = None,
+) -> str:
+    """Print numbered list, ask for index (default = current recommendation)."""
+    if not items:
+        raise ValueError(f"{title}: пустое меню")
+    default_idx = 1
+    for i, item in enumerate(items, 1):
+        if item.key == default:
+            default_idx = i
+            break
+    safe_title = escape(title)
+    lines = [f"[bold cyan]{safe_title}[/bold cyan]"]
+    for i, item in enumerate(items, 1):
+        label = escape(item.label)
+        if i == default_idx:
+            lines.append(f"  [cyan]{i}.[/cyan] {label} [green]←[/green]")
+        else:
+            lines.append(f"  [dim]{i}.[/dim] {label}")
+    emit = show
+    if emit is None:
+        from gpu_rent.term import log as emit  # type: ignore[assignment]
+    for line in lines:
+        emit(line)
+    raw = ask(f"{title} [1-{len(items)}]", str(default_idx))
+    return resolve_menu_choice(raw, items, default_key=items[default_idx - 1].key)