fix: Remove Number() conversions that corrupt uint64 IDs

JavaScript's Number type cannot accurately represent uint64 values exceeding
Number.MAX_SAFE_INTEGER (2^53-1). Converting these IDs to numbers causes
precision loss and API errors.

Root cause found:
- match/[id]/+layout.ts: `Number(params.id)` corrupted match IDs
- player/[id]/+page.ts: `Number(params.id)` corrupted player IDs

Example of the bug:
- URL param: "3638078243082338615" (correct)
- After Number(): 3638078243082339000 (rounded!)
- API response: "Match 3638078243082339000 not found"

Changes:
- Remove Number() conversions in route loaders
- Keep params.id as string throughout the application
- Update API functions to only accept string (not string | number)
- Update MatchesQueryParams.player_id type to string
- Add comprehensive transformers for legacy API responses
- Transform player stats: duo→mk_2, triple→mk_3, steamid64→id
- Build full Steam avatar URLs
- Make share_code optional (not always present)

This ensures uint64 IDs maintain full precision from URL → API → response.

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

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

src/lib/schemas/api.schema.ts

@@ -23,7 +23,7 @@ export const apiResponseSchema = <T extends z.ZodTypeAny>(dataSchema: T) =>
 
 /** MatchParseResponse schema */
 export const matchParseResponseSchema = z.object({
-	match_id: z.number().positive(),
+	match_id: z.string().min(1), // uint64 as string to preserve precision
 	status: z.enum(['parsing', 'queued', 'completed', 'error']),
 	message: z.string(),
 	estimated_time: z.number().int().positive().optional()
@@ -31,7 +31,7 @@ export const matchParseResponseSchema = z.object({
 
 /** MatchParseStatus schema */
 export const matchParseStatusSchema = z.object({
-	match_id: z.number().positive(),
+	match_id: z.string().min(1), // uint64 as string to preserve precision
 	status: z.enum(['pending', 'parsing', 'completed', 'error']),
 	progress: z.number().int().min(0).max(100).optional(),
 	error_message: z.string().optional()