Transcribe and clean up on this machine, without installing anything first

whisper-server is started on --inference-path /v1/audio/transcriptions,
which is exactly the path api.py already builds for the hosted providers,
and llama-server answers /chat/completions the way OpenRouter does. So the
local half is one more base URL rather than a second code path: worker.py,
filetranscribe.py and meeting.py are untouched, and dictation, subtitles
and meetings all work here on the first try.

Three findings worth naming, none of them in the new code:

whisper.cpp cuts segments on tokens, which in Turkish lands inside a word
about as often as between two. Pasted raw that gives "akraba değ\niller.";
in a subtitle it gives a cue reading "değ". Whisper marks the start of a
word with a leading space, so a piece that does not begin with one
continues the word above it.

A small model will repeat the transcript until the context is full, and
every one of those tokens is a second of somebody waiting: measured at 206
seconds, and 25 with a ceiling on the reply. Hosted models are left alone,
where the same runaway is rare and a ceiling would cut the minutes short.

A server outlives SIGTERM and SIGKILL holding its model in memory. Signals
are now turned into an event Qt delivers, since Qt blocks in C where a
Python handler never runs, and a pid file lets the next start sweep up
what a SIGKILL left behind.

The minutes keep their own provider rather than following cleanup's. The
two jobs are not the same size: a 4B model here will strip the filler words
out of a dictation and will not write up an hour long meeting.

The suite runs offline now: a test that reaches the network says so instead
of quietly going there.

filetranscribe.py

@@ -127,17 +127,11 @@ class FileTranscriber(QObject):
     def _cleanup(self, text, timestamps):
         conf = self.conf
         prompt = conf.cleanup_prompt(with_timestamps=timestamps, subtitles=True)
+        target = conf.cleanup_target()
         out = []
         for block in split_text(text, timestamps):
             self._check()
-            out.append(api.cleanup(
-                block,
-                conf.openrouter_key(),
-                conf["cleanup_model"],
-                prompt,
-                reasoning=conf["cleanup_reasoning"],
-                base_url=conf["openrouter_base_url"],
-            ))
+            out.append(api.cleanup(target, block, prompt))
         return ("\n" if timestamps else "\n\n").join(out)