Implement complete inventory system with equipment database

Features:
- HP Control component with damage/heal/direct modes (mobile-optimized)
- Conditions system with PF2e condition database
- Equipment database with 5,482 items from PF2e (weapons, armor, equipment)
- AddItemModal with search, category filters, and pagination
- Bulk tracking with encumbered/overburdened status display
- Item management (add, remove, toggle equipped)

Backend:
- Equipment module with search/filter endpoints
- Prisma migration for equipment detail fields
- Equipment seed script importing from JSON data files
- Extended Equipment model (damage, hands, AC, etc.)

Frontend:
- New components: HpControl, AddConditionModal, AddItemModal
- Improved character sheet with tabbed interface
- API methods for equipment search and item management

Documentation:
- CLAUDE.md with project philosophy and architecture decisions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server/prisma/migrations/20260118225853_add_equipment_detail_fields/migration.sql

@@ -0,0 +1,16 @@
+-- AlterTable
+ALTER TABLE "Equipment" ADD COLUMN     "ac" INTEGER,
+ADD COLUMN     "armorCategory" TEXT,
+ADD COLUMN     "armorGroup" TEXT,
+ADD COLUMN     "checkPenalty" INTEGER,
+ADD COLUMN     "damageType" TEXT,
+ADD COLUMN     "dexCap" INTEGER,
+ADD COLUMN     "duration" TEXT,
+ADD COLUMN     "reload" TEXT,
+ADD COLUMN     "shieldBt" INTEGER,
+ADD COLUMN     "shieldHardness" INTEGER,
+ADD COLUMN     "shieldHp" INTEGER,
+ADD COLUMN     "speedPenalty" INTEGER,
+ADD COLUMN     "strength" INTEGER,
+ADD COLUMN     "usage" TEXT,
+ADD COLUMN     "weaponGroup" TEXT;