refactor(logging): route frontend console calls through the logger

TRACES: | DR-204

484 ungated `console.*` calls across 63 non-test frontend files shipped to
end users with no way to turn them off. Mechanical substitution, no control
flow, error handling or message semantics changed:

  console.log / console.debug -> log.debug
  console.info                -> log.info
  console.warn                -> log.warn
  console.error               -> log.error

Hand-written `"[Scope] …"` prefixes are dropped where the logger's scope
now carries them; scope names that already existed are preserved verbatim
(`[Auth]`, `[VideoPlayer]`, `[PiP]`, …) and inferred from the filename
where a file had none. `src/routes/player/[id]/+page.svelte` keeps its
`NextEpisode` and `AutoPlay` sub-scopes as separate loggers rather than
flattening them into the page scope.

`grep -rn 'console\.' src/` now matches nothing outside the tests and the
facade itself.

src/lib/services/deviceId.ts

@@ -9,6 +9,9 @@
  */
 
 import { commands } from "$lib/api/bindings";
+import { createLogger } from "$lib/utils/logger";
+
+const log = createLogger("deviceId");
 
 let cachedDeviceId: string | null = null;
 
@@ -34,7 +37,7 @@ export async function getDeviceId(): Promise<string> {
     cachedDeviceId = deviceId;
     return deviceId;
   } catch (e) {
-    console.error("[deviceId] Failed to get device ID from backend:", e);
+    log.error("Failed to get device ID from backend:", e);
     throw new Error("Failed to initialize device ID: " + String(e));
   }
 }