Refactor: Remove unused Whisper variants

This commit removes the `whisper_variant` and `whisper_hotwords_variant`
fields from the `run_id` generation and the `print_meta_summary`
function.

These variants are no longer used as the project is shifting focus to
LLM-based generation. The `run_full_case.rs` example has also been
updated to reflect this change.

server/src/main.rs

@@ -10,7 +10,7 @@ use tracing_subscriber::util::SubscriberInitExt;
 
 use doctate_server::AppState;
 use doctate_server::analyze;
-use doctate_server::config::Config;
+use doctate_server::config::{AsrBackend, Config};
 use doctate_server::events;
 use doctate_server::gazetteer::{Gazetteer, SpellbookDict};
 use doctate_server::settings::Settings;
@@ -54,6 +54,15 @@ async fn main() {
         );
     }
 
+    info!(backend = ?config.asr_backend, "ASR backend");
+    if config.asr_backend == AsrBackend::Canary {
+        warn!(
+            "ASR_BACKEND=canary — Whisper container on the GPU host \
+             must be stopped (12 GB VRAM budget shared with Ollama; \
+             see docs/canary.md §2.6)."
+        );
+    }
+
     info!(
         prompt_chars = settings.llm.system_prompt.chars().count(),
         "system prompt loaded"