[Feature] Configurable starting gold amounts in Homebrew settings

Added `initialAmount` field to each currency type (coins, handfuls, bags, chests)
in the Homebrew settings schema. Defaults match book values (0, 1, 0, 0).

- Homebrew.mjs: added `initialAmount` NumberField per currency; `_initializeSource`
  coerces empty submissions to 0; `refreshConfig()` syncs values to
  `CONFIG.DH.RESOURCE.character.initialCurrency`
- resourceConfig.mjs: added mutable `initialCurrency` object on `character` export
- actorField.mjs: added `CharacterGoldField` subclass that reads initial values
  from config at actor creation time
- character.mjs: switched from `GoldField` to `CharacterGoldField`
- settings.hbs: restructured currency section to CSS Grid with column headers
  ("Quantity Name" / "Starting Amount") instead of per-field inline labels
- settings.less: added `.currency-rows` grid styles
- en.json: added `quantityName` and `initialAmount` localisation keys

module/data/actor/character.mjs

@@ -3,7 +3,7 @@ import ForeignDocumentUUIDField from '../fields/foreignDocumentUUIDField.mjs';
 import DhLevelData from '../levelData.mjs';
 import { commonActorRules } from './base.mjs';
 import DhCreature from './creature.mjs';
-import { attributeField, stressDamageReductionRule, bonusField, GoldField } from '../fields/actorField.mjs';
+import { attributeField, stressDamageReductionRule, bonusField, CharacterGoldField } from '../fields/actorField.mjs';
 import { ActionField } from '../fields/actionField.mjs';
 import DHCharacterSettings from '../../applications/sheets-configs/character-settings.mjs';
 import { getArmorSources } from '../../helpers/utils.mjs';
@@ -64,7 +64,7 @@ export default class DhCharacter extends DhCreature {
                     core: new fields.BooleanField({ initial: false })
                 })
             ),
-            gold: new GoldField(),
+            gold: new CharacterGoldField(),
             scars: new fields.NumberField({ initial: 0, integer: true, label: 'DAGGERHEART.GENERAL.scars' }),
             biography: new fields.SchemaField({
                 background: new fields.HTMLField(),