Enhance LLM and SwarmUI integration with improved configuration options

- Updated `env.example` and `gpu-rent.vars.example` to include new variables for LLM runtime and SwarmUI options.
- Refactored CLI commands to support interactive selection of LLM runtime and workload type (SwarmUI, LLM, or both).
- Improved access link generation to handle cases where SwarmUI is disabled, providing clearer user feedback.
- Enhanced provisioning logic to conditionally bootstrap SwarmUI based on user configuration, allowing for LLM-only setups.
- Updated documentation across multiple files to reflect changes in LLM integration, CLI usage, and configuration management.

src/gpu_rent/tunnel.py

@@ -72,16 +72,18 @@ def decide_watch(status: str | None, tunnel_alive: bool) -> WatchDecision:
 
 
 def tunnel_forwards(cfg: Config) -> list[tuple[int, int]]:
-    """List of (local_port, remote_port). SwarmUI always; LLM if configured.
-
-    Prefer live config (`LLM_RUNTIME`) over stale state.notes.
-    """
-    pairs = [(cfg.swarmui_local_port, 7801)]
+    """List of (local_port, remote_port). SwarmUI if enabled; LLM if configured."""
+    pairs: list[tuple[int, int]] = []
+    if bool(getattr(cfg, "enable_swarmui", True)):
+        pairs.append((cfg.swarmui_local_port, 7801))
     runtime = normalize_runtime(cfg.llm_runtime)
     if runtime == "ollama":
         pairs.append((cfg.ollama_local_port, 11434))
     elif runtime == "llamacpp":
         pairs.append((cfg.llamacpp_local_port, 8080))
+    if not pairs:
+        # Failsafe: at least SwarmUI port so tunnel isn't empty.
+        pairs.append((cfg.swarmui_local_port, 7801))
     return pairs
 
 
@@ -181,14 +183,23 @@ def run_tunnel(
     log("watchdog: EXPIRED → unshelve + reconnect")
 
     server = _start_forwarder(cfg, current_host, forwards)
-    swarm_url = f"http://127.0.0.1:{cfg.swarmui_local_port}"
+    swarm_on = bool(getattr(cfg, "enable_swarmui", True))
+    runtime = normalize_runtime(cfg.llm_runtime)
+    if swarm_on:
+        open_url = f"http://127.0.0.1:{cfg.swarmui_local_port}"
+    elif runtime == "ollama":
+        open_url = f"http://127.0.0.1:{cfg.ollama_local_port}"
+    elif runtime == "llamacpp":
+        open_url = f"http://127.0.0.1:{cfg.llamacpp_local_port}"
+    else:
+        open_url = f"http://127.0.0.1:{cfg.swarmui_local_port}"
 
     from gpu_rent.access_card import print_access_card
 
     print_access_card(cfg, tunneled=True, host=current_host)
 
     if open_browser:
-        webbrowser.open(swarm_url)
+        webbrowser.open(open_url)
 
     state = load_state()
     state.phase = "ready_tunneled"