refactor: data/modpack_rules → data/rules; auto-apply on resort path

The directory was misnamed — these are wsid-triggered sorting-rule
overlays, not modpack-specific. HellDrinx happens to be a modpack but
RV Interior Expansion isn't; both use the same generic mechanism.

Renames:
  data/modpack_rules/        → data/rules/
  _MODPACK_RULES_*           → _RULES_*
  _modpack_rules_for         → _auto_rules_for
  _parse_rules_with_modpacks → _parse_rules_combined
  _emit_modpack_rules_warnings → _emit_rules_applied_warnings
  warning tag "modpack-rules-applied" → "rules-applied"

Bug fix: /api/resort was passing {} rules to sort_mods, silently
dropping every auto-injected rule. The frontend runs an automatic
resort after each /api/sort (driven by localStorage branchSelections),
so the user always saw the resort output — where rv_expansion.txt's
loadAfter chain wasn't taking effect. Now resort goes through
_parse_rules_combined and emits rules-applied warnings the same way
/api/sort does.

data/rules/helldrinx.txt

@@ -0,0 +1,71 @@
+; HellDrinx modpack — bundled sorting rules
+; Triggers: HellDrinx FULL (3672556207), HellDrinx LITE (3662909244).
+; Auto-injected by app.py:_auto_rules_for() when either trigger wsid is in
+; the user's input. User-supplied rules are appended afterward and override
+; these on conflicting keys.
+;
+; Source: HellDrinx FULL/LITE — keep this file in sync with the modpack's
+; upstream sorting_rules.txt when it updates.
+
+[PROJECTRVInterior42]
+loadFirst=on
+[TombBody]
+loadAfter=SPNCC,SPNCCDetails,SPNCCDetailsHD,SpnHairAPI,SpnCloth,SpnOpenCloth,SPNCCFaces,SpnHair,FH,KATTAJ1_ClothesCore,KATTAJ1_Military,[J&G] Black Multicam Uniform,[J&G] British DPM Uniform,[J&G] Caution Pack,[J&G] Firefighter Uniform,[J&G] Neon Vandals Uniform,[J&G] SWAT Uniform,[J&G] Trauma Responder Uniform,[J&G] Umbrella Corp Uniform,[J&G] Alpine Multicam Uniform,[J&G] Desert Multicam Uniform,[J&G] Flecktarn Uniform,[J&G] Forest Multicam Uniform,[J&G] Jordan's Tailoring Buff,[J&G] MARPAT Camo Uniform,[J&G] XKU Uniform,AliceGear,CamisetasSeleccion,CerberusPack,DarkWpnSlings,EFTBP,GanydeBielovzki's Frockin Shirts n Ties,GanydeBielovzki's Frockin Splendor!,GanydeBielovzki's Frockin Splendor! Vol.2,GanydeBielovzki's Frockin Splendor! Vol.3,GanydeBielovzki's Frockin Splendor! Vol.4,GanydeBielovzki's Frockin Splendor! Vol.5,GanydeBielovzki's Frockin Wiseguys,H_E_C_U,HardwoodsTurnoutGear,KITTYOWO,LynxPack,MilitaryPonchosRELOADED,newclothesmodels,TwoWeaponsB,VanillaGearExpanded,zReApoPonchosB42,zReArmorPackBYKB42,ArmoredVests,ArmoredVestsPatch
+loadLast=on
+[TombBodyCustom]
+loadAfter=TombBody
+loadLast=on
+[TombBodyTexDOLL]
+loadAfter=TombBodyCustom
+incompatibleMods=TombBodyTexNUDE,TombBodyTex
+loadLast=on
+[TombGothTexDOLL]
+loadAfter=TombBodyTexDOLL
+incompatibleMods=TombGothTexNUDE,TombBodyTexNUDE,TombBodyTex
+loadLast=on
+[TombGothHair]
+loadAfter=TombBody,FH
+[TombBodyCompat]
+loadAfter=TombBody
+loadLast=on
+[TombWardrobeALT]
+loadAfter=TombBody
+loadLast=on
+[Optimal]
+loadLast=on
+[Performance]
+loadLast=on
+[ProjectSummerCar]
+loadAfter=VehicleRepairOverhaul,VehicleSalvageOverhaulB42
+incompatibleMods=Ivmakk_RestoreEngineQuality
+loadLast=on
+category=undefined
+[ItemretexturePSC]
+loadLast=on
+category=undefined
+[VehicleRepairOverhaul]
+loadBefore=ProjectSummerCar,Ivmakk_RestoreEngineQuality
+incompatibleMods=SimpleAutoParts
+loadLast=on
+[VehicleSalvageOverhaulB42]
+loadBefore=ProjectSummerCar,Ivmakk_RestoreEngineQuality
+loadLast=on
+[MoreDescriptionForTraits4213]
+loadBefore=FIX_DetailedDescriptionsForOccupationsAndTraits
+[HellDrinxJSONFix]
+loadAfter=ItemretexturePSC,TombBodyCompat
+loadLast=on
+[HellDrinxTranslations]
+loadAfter=ItemretexturePSC
+loadLast=on
+[HellDrinxBugFixes]
+loadAfter=ItemretexturePSC,TombBodyCompat,TombWardrobeALT,HellDrinxStrangers,SpnCloth
+loadLast=on
+[HellDrinxEssentials]
+loadLast=on
+[HellDrinxBugFixesFirst]
+loadFirst=on
+[TACPDM2]
+loadLast=on
+[damnlib]
+loadFirst=on

data/rules/rv_expansion.txt

@@ -0,0 +1,19 @@
+; RV Interior Expansion (B42) — sorting rules
+; Triggers:
+;   - 3618427553 (RVInteriorExpansion, map folder rvupdate)
+;   - 3622163276 (RVInteriorExpansionPart2, map folder rv2)
+; Auto-injected by app.py:_auto_rules_for() when either trigger wsid is
+; in the user's input. User-supplied rules are appended afterward and
+; override these on conflicting keys.
+;
+; Authored ordering: PROJECTRVInterior42 → RVInteriorExpansion → RVInteriorExpansionPart2.
+; The expansion mods don't declare these loadAfter relationships in their own
+; mod.info, so without these rules sortof has nothing to base the cluster
+; ordering on (PROJECTRVInterior42 is in PREORDER slot 7 already; expansions
+; just need to chain off of it).
+
+[RVInteriorExpansion]
+loadAfter=PROJECTRVInterior42
+
+[RVInteriorExpansionPart2]
+loadAfter=RVInteriorExpansion