add entity queries for weapons/characters/summons

creates query options factory for canonical game data with:
- 1 hour stale time (data rarely changes)
- 24 hour garbage collection
- query key helpers for cache invalidation

src/lib/api/queries/entity.queries.ts

@@ -0,0 +1,102 @@
+/**
+ * Entity Query Options Factory
+ *
+ * Provides type-safe, reusable query configurations for entity (weapon, character, summon) operations
+ * using TanStack Query v6 patterns.
+ *
+ * @module api/queries/entity
+ */
+
+import { queryOptions } from '@tanstack/svelte-query'
+import { entityAdapter } from '$lib/api/adapters/entity.adapter'
+
+/**
+ * Entity query options factory
+ *
+ * Provides query configurations for all entity-related operations.
+ * These can be used with `createQuery` or for prefetching.
+ *
+ * @example
+ * ```typescript
+ * import { createQuery } from '@tanstack/svelte-query'
+ * import { entityQueries } from '$lib/api/queries/entity.queries'
+ *
+ * // Single weapon by ID
+ * const weapon = createQuery(() => entityQueries.weapon(id))
+ *
+ * // Single character by ID
+ * const character = createQuery(() => entityQueries.character(id))
+ * ```
+ */
+export const entityQueries = {
+	/**
+	 * Single weapon query options
+	 *
+	 * @param id - Weapon ID
+	 * @returns Query options for fetching a single weapon
+	 */
+	weapon: (id: string) =>
+		queryOptions({
+			queryKey: ['weapon', id] as const,
+			queryFn: () => entityAdapter.getWeapon(id),
+			enabled: !!id,
+			staleTime: 1000 * 60 * 60, // 1 hour - canonical data rarely changes
+			gcTime: 1000 * 60 * 60 * 24 // 24 hours
+		}),
+
+	/**
+	 * Single character query options
+	 *
+	 * @param id - Character ID
+	 * @returns Query options for fetching a single character
+	 */
+	character: (id: string) =>
+		queryOptions({
+			queryKey: ['character', id] as const,
+			queryFn: () => entityAdapter.getCharacter(id),
+			enabled: !!id,
+			staleTime: 1000 * 60 * 60, // 1 hour - canonical data rarely changes
+			gcTime: 1000 * 60 * 60 * 24 // 24 hours
+		}),
+
+	/**
+	 * Single summon query options
+	 *
+	 * @param id - Summon ID
+	 * @returns Query options for fetching a single summon
+	 */
+	summon: (id: string) =>
+		queryOptions({
+			queryKey: ['summon', id] as const,
+			queryFn: () => entityAdapter.getSummon(id),
+			enabled: !!id,
+			staleTime: 1000 * 60 * 60, // 1 hour - canonical data rarely changes
+			gcTime: 1000 * 60 * 60 * 24 // 24 hours
+		})
+}
+
+/**
+ * Query key helpers for cache invalidation
+ *
+ * @example
+ * ```typescript
+ * import { useQueryClient } from '@tanstack/svelte-query'
+ * import { entityKeys } from '$lib/api/queries/entity.queries'
+ *
+ * const queryClient = useQueryClient()
+ *
+ * // Invalidate a specific weapon
+ * queryClient.invalidateQueries({ queryKey: entityKeys.weapon('abc123') })
+ *
+ * // Invalidate all weapons
+ * queryClient.invalidateQueries({ queryKey: entityKeys.weapons() })
+ * ```
+ */
+export const entityKeys = {
+	weapons: () => ['weapon'] as const,
+	weapon: (id: string) => [...entityKeys.weapons(), id] as const,
+	characters: () => ['character'] as const,
+	character: (id: string) => [...entityKeys.characters(), id] as const,
+	summons: () => ['summon'] as const,
+	summon: (id: string) => [...entityKeys.summons(), id] as const
+}