feat: pzmm conflict detection + content-type categorization

- mod_files manifest table populated at parse time
- POST /api/conflicts endpoint
- mod_types fingerprinting feeds derive_category
- DD filelist regex broadened to cover conflict-eligible exts
- media/maps/<*>/* excluded from manifest (per-mod namespaced,
  no conflict value, can be tens of MB per mod)

Plan: docs/plans/2026-05-04-pzmm-conflict-and-typing.md

api/mlos_sort.py

@@ -130,6 +130,11 @@ class ModInfo:
     # signal for build / multiplayer / category detection. Distinct from
     # `tags` which is mod.info-side (freeform).
     workshop_tags: List[str] = field(default_factory=list)
+    # pzmm-style content fingerprint (Maps, Vehicles, Weapons, Traits, …)
+    # populated by worker.build_manifest_and_types at parse time. Empty when
+    # files_manifest_built=false (older cached rows); derive_category falls
+    # through to the existing cascade in that case.
+    mod_types: List[str] = field(default_factory=list)
     warnings: Dict[str, List[str]] = field(default_factory=dict)
 
 
@@ -389,30 +394,77 @@ def _name_has(name: str, hints: List[str]) -> bool:
     return any(h in n for h in hints)
 
 
+# pzmm content-type → sortof CATEGORY_ORDER mapping. "skip" entries fall
+# through to the existing derive_category cascade. Items/Animations/Lua/Unknown
+# are too generic; Maps/Sounds/Patch/Vehicles/Clothing duplicate signals already
+# captured by the cascade but stay here as fallbacks for poorly-tagged mods.
+_TYPE_TO_CAT: Dict[str, str] = {
+    "Maps":         "map",
+    "Vehicles":     "vehicle",
+    "Weapons":      "weapon",
+    "Clothing":     "wearable",
+    "Traits":       "code",
+    "Professions":  "profession",
+    "Recipes":      "crafting",
+    "Tiles":        "tile",
+    "Textures":     "texture",
+    "Sounds":       "sound",
+    "UI":           "ui",
+    "Translations": "translation",
+    "Patch":        "patch",
+    "Dependency":   "tweaks",
+    "Framework":    "tweaks",
+}
+
+
+def _types_to_category(mod_types: List[str], name: str) -> Optional[str]:
+    """First mod_type that maps to a sortof CATEGORY_ORDER bucket wins.
+    Returns None if mod_types contains only skip-types (Items/Animations/Lua/
+    Unknown), so the caller can fall through to the existing cascade."""
+    for t in mod_types:
+        cat = _TYPE_TO_CAT.get(t)
+        if cat:
+            # vehicle_spawn refinement matches the downstream ws_tag check.
+            if cat == "vehicle" and name and "spawn zone" in name.lower():
+                return "vehicle_spawn"
+            return cat
+    return None
+
+
 def derive_category(mod: ModInfo) -> str:
     """Best-effort category from mod.info + workshop_meta.tags + name.
 
     Detection order (most specific → least):
       1. mod.info `category=` if explicit and recognized.
-      2. patch / fix name regex (Spec G-patch).
-      3. library/framework name regex (extends FRAMEWORK_KEYS).
-      4. mod.maps non-empty → map.
-      5. moodle / profession / movement / specific gameplay axes by name.
-      6. Workshop tags (canonical Steam controlled vocab): Audio + 'music' →
+      2. pzmm-style mod_types fingerprint (when files_manifest_built=true).
+      3. patch / fix name regex (Spec G-patch).
+      4. library/framework name regex (extends FRAMEWORK_KEYS).
+      5. mod.maps non-empty → map.
+      6. moodle / profession / movement / specific gameplay axes by name.
+      7. Workshop tags (canonical Steam controlled vocab): Audio + 'music' →
          music; Audio → sound; Weapons → weapon; Vehicles → vehicle;
          Clothing/Armor + 'armor' → armor, else wearable; Building →
          building; Farming → farming; Food → food; Skills → profession
          (or moodle); Interface → ui; Textures → texture;
          Language/Translation → translation; QOL → qol; Multiplayer alone
          → multiplayer.
-      7. mod.info tags (freeform fallback).
-      8. FRAMEWORK_KEYS substring match → tweaks.
-      9. Default → other.
+      8. mod.info tags (freeform fallback).
+      9. FRAMEWORK_KEYS substring match → tweaks.
+     10. Default → other.
     """
     if mod.category in CATEGORY_ORDER and mod.category != "undefined":
         return mod.category
 
     name = mod.name or ""
+
+    # pzmm-style content fingerprint takes precedence over name regex when
+    # available. Empty mod_types means files_manifest_built=false (older
+    # cached row); fall through to existing cascade.
+    if mod.mod_types:
+        cat = _types_to_category(mod.mod_types, name)
+        if cat:
+            return cat
+
     if name and _PATCH_NAME_RE.search(name):
         return "patch"
     if _name_has(name, _LIB_NAME_HINTS) or (name and _LIB_NAME_RE.search(name)):