refactor: move game-specific import logic into profiles; unblock Tomie import

- Add app/games: GameProfile base, registry, ReaderHooks and renpy/naninovel/
  tomie profiles. pipeline, preflight, detect and mods dispatch via the registry
- Move tomie_* converter modules to app/games/tomie and split out reader hooks,
  import, mod validation and known defects
- Tolerate the 31 authoring defects of the pinned Tomie build as report
  warnings (exact list, per-script counts); any new defect still blocks import
- Frontend: runtime registry (runtimes.ts) with lazy Tomie launcher
- Add profile/registry tests and docs/GAME_PROFILES.md; update IMPORT.md

Full media export of the original Tomie build is not yet verified.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

backend/app/converter/pipeline.py

@@ -43,6 +43,17 @@ class Result:
     size: int
 
 
+def _profile_converter(detection):
+    """The game profile that converts this game itself, or None for the built-in Ren'Py path."""
+    from app.games.registry import select
+
+    profile = select(detection.engine, detection.root)
+    if profile is None:
+        raise CompatibilityError(detection.engine, [Issue(
+            "unsupported_engine", f"Для движка {detection.engine} нет профиля импорта")])
+    return None if profile.converts_in_pipeline else profile
+
+
 def convert_archive(archive: Path, filename: str, work: Path, progress: Progress) -> Result:
     """Convert an uploaded archive, or an already unpacked game directory (left untouched)."""
     started = time.monotonic()
@@ -55,9 +66,8 @@ def convert_archive(archive: Path, filename: str, work: Path, progress: Progress
 
     if archive.is_dir():
         detection = detect(archive)
-        if detection.engine == "naninovel":
-            from app.converter.naninovel import convert_naninovel
-            return convert_naninovel(detection.root, work, progress)
+        if (profile := _profile_converter(detection)):
+            return profile.convert(detection.root, work, progress)
         # Inspect scripts before copying/converting multi-gigabyte media collections.
         from app.converter.preflight import inspect_directory
         inspect_directory(detection.root)
@@ -71,9 +81,8 @@ def convert_archive(archive: Path, filename: str, work: Path, progress: Progress
         progress("Распаковка архива")
         extract(archive, filename, src_root)
         detection = detect(src_root)
-        if detection.engine == "naninovel":
-            from app.converter.naninovel import convert_naninovel
-            return convert_naninovel(detection.root, work, progress)
+        if (profile := _profile_converter(detection)):
+            return profile.convert(detection.root, work, progress)
         game_dir = find_game_dir(src_root)
 
     rpas = sorted(game_dir.rglob("*.rpa"))