Add subtitle dictionaries, Polish number normalizer, ComfyUI lifecycle control

Text processing before TTS:

- dictionary.txt rewrites words and phrases (km/h, np., units). Rules compile
  into one alternation applied in a single pass, so replacements never chain
  and longest-literal wins. Case-sensitive, whole-word.
- A per-queue second dictionary, written by the GUI into the first video's job
  folder and merged with the shared one (--dictionary-extra).
- ALL-CAPS blocks become Title Case rather than sentence case: lowercasing
  destroyed proper nouns inside captions ("NASA - MARGO MADISON") and invited
  the normalizer to "correct" the name. Paired clips in output/clips/all-caps
  showed the TTS reads both casings the same.

normalizer/ — digits to spoken Polish, in its own venv because it needs
transformers>=5, which must not touch ComfyUI's pinned versions:

- Two backends. Plain integers go to num2words for the value and a general
  Polish LLM for the case; times, dates, decimals and identifiers go to a 0.6B
  fine-tune. Measured on 40 real subtitle lines, each is clearly better than
  the other on its half. 74% of numbered blocks take the first leg.
- Guards on every answer: runaway length, repetition loops, invalid bytes,
  leftover digits, a lost minus sign, a changed number, a lost word. A failure
  falls back to num2words, which is nominative but never wrong about the value.
- ComfyUI is asked to unload before normalizing; a normalizer that does not fit
  in VRAM is spilled to RAM silently at 5x the cost.

Backend lifecycle:

- ComfyUI is found by port through /proc, so a backend started by hand is
  managed too. SIGTERM escalates to SIGKILL, and a suspended process is killed
  outright since it never runs its handlers.
- A clip that kills the backend is retried three times, each with a different
  seed (the aborts are seed-dependent, not text-dependent), then skipped and
  reported so an overnight queue keeps moving.
- start_comfyui.sh execs python, so the script's PID is ComfyUI's.
- GUI gains ComfyUI and Queue dictionary buttons; quitting stops the backend.

--resume-from now reuses the job folder's tts_input.srt instead of reparsing
the subtitles, so block N still pairs with clip_NNNN.flac.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

dictionary.txt

@@ -0,0 +1,49 @@
+# lektor_ai_comfy — replacement dictionary
+#
+# Words and phrases rewritten in the subtitles before they are sent to the TTS
+# engine, for anything the model reads out wrong: abbreviations, units, symbols,
+# names spelled in a way it mispronounces.
+#
+# One rule per line:
+#
+#     pattern = replacement
+#
+#   * Matching is CASE-SENSITIVE and matches whole words only: "np." leaves
+#     "znp." alone, and "Joshua" leaves "joshua" alone.
+#   * The replacement is inserted exactly as written — nothing is re-capitalised
+#     for you. Note that the first letter of every subtitle block is already
+#     capitalised before these rules run, so if a word can start a block, add a
+#     second rule for the capitalised form.
+#   * Longer patterns win: "km/h" below is used even though a plain "km" rule
+#     would also fit, whatever order the two are written in.
+#   * The replacement is never re-scanned, so rules cannot feed into each other.
+#   * A pattern wrapped in slashes is a regular expression, and \1 \2 … in the
+#     replacement refer to its groups.
+#   * A line starting with # or ; is a comment. An empty replacement deletes the
+#     phrase.
+#   * "->" and "=>" work as separators too, if you prefer them to "=".
+#
+# The changes are visible in clips/tts_input.srt after a run — check there if a
+# rule is not doing what you expect.
+
+
+# ── Units ──────────────────────────────────────────────────────────────────
+km/h = kilometrów na godzinę
+m/s = metrów na sekundę
+
+# ── Abbreviations ──────────────────────────────────────────────────────────
+np. = na przykład
+tzn. = to znaczy
+# These two almost always close a sentence, so the dot is kept; drop it if you
+# see an unwanted pause mid-sentence.
+itp. = i tym podobne.
+itd. = i tak dalej.
+m.in. = między innymi
+24/7 = dwadzieścia cztery na siedem
+
+# ── Symbols ────────────────────────────────────────────────────────────────
+/(\d+)\s*%/ = \1 procent
+/(\d+)\s*°C/ = \1 stopni Celsjusza
+& = i
+
+# ── Your own rules below ───────────────────────────────────────────────────