fix(providers): rename Freepik slug to Magnific and validate Magnific API keys (#10594)

Canonical provider id renamed freepik → magnific (Magnific Mystic official API), with a permanent redirect + runtime alias so old freepik/<model> traffic and /dashboard/providers/freepik URLs keep working. Existing provider=freepik connection rows are rewritten to magnific by migration 160.

Closes #10604.

Validated in an isolated worktree boarded onto origin/release/v3.8.50 (0 conflicts, 138 files):
- Focused suite: 54/54 tests pass (magnific-image-handler, provider-validation-image-only, provider-alias-uniqueness, redirects-cli-renames).
- check-file-size, check-changelog-integrity: OK.
- typecheck:core: clean.
- check-complexity / check-cognitive-complexity: OK, both under baseline.

Co-authored-by: RaviTharuma <RaviTharuma@users.noreply.github.com>

src/shared/validation/compressionConfigSchemas.ts

@@ -71,6 +71,8 @@ export const rtkConfigSchema = z
     trustProjectFilters: z.boolean().optional(),
     rawOutputRetention: rtkRawOutputRetentionSchema.optional(),
     rawOutputMaxBytes: z.number().int().min(1024).max(10_000_000).optional(),
+    rawOutputMaxFiles: z.number().int().min(1).max(10_000_000).optional(),
+    rawOutputMaxAgeDays: z.number().int().min(1).max(3650).optional(),
     enableGrouping: z.boolean().optional(),
     groupingThreshold: z.number().int().min(2).max(100).optional(),
     stripCodeComments: z.boolean().optional(),