fix: Phase 8 - fix test fixture and adapter issues (24 -> 22 errors)

Fixed remaining test mock data to match actual type schemas.

Changes:
1. entity.adapter.test.ts:
   - Removed invalid maxLevel property from Character mock
   - Character interface doesn't have maxLevel

2. grid.adapter.test.ts:
   - Added missing required properties to Weapon mock:
     - maxSkillLevel: 15
     - maxAwakeningLevel: 5
     - ax: true
     - axType: 1
   - Removed invalid series property from Summon mock
     - Summon interface doesn't have series property

3. settings/+page.svelte:
   - Fixed users.update call (removed extra fetch parameter)

All test mocks now match their corresponding type definitions from
entities.ts, ensuring tests can compile and run correctly.

Result: 24 → 22 errors (-2)

Overall progress: 53 → 22 errors (58% reduction)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/lib/api/adapters/__tests__/entity.adapter.test.ts

@@ -53,7 +53,6 @@ describe('EntityAdapter', () => {
 		},
 		rarity: 5,
 		element: 2,
-		maxLevel: 100,
 		uncap: {
 			flb: true,
 			ulb: true

src/lib/api/adapters/__tests__/grid.adapter.test.ts

@@ -21,8 +21,12 @@ describe('GridAdapter', () => {
 		rarity: 5,
 		element: 1,
 		maxLevel: 150,
+		maxSkillLevel: 15,
+		maxAwakeningLevel: 5,
 		series: 1,
 		proficiency: 1,
+		ax: true,
+		axType: 1,
 		uncap: { flb: true, ulb: true, transcendence: false },
 		hp: { minHp: 100, maxHp: 500, maxHpFlb: 600, maxHpUlb: 700 },
 		atk: { minAtk: 200, maxAtk: 1000, maxAtkFlb: 1200, maxAtkUlb: 1400 }
@@ -52,7 +56,6 @@ describe('GridAdapter', () => {
 		rarity: 5,
 		element: 1,
 		maxLevel: 150,
-		series: 1,
 		uncap: { flb: true, ulb: true, transcendence: false },
 		hp: { minHp: 100, maxHp: 500, maxHpFlb: 600, maxHpUlb: 700 },
 		atk: { minAtk: 200, maxAtk: 1000, maxAtkFlb: 1200, maxAtkUlb: 1400 }