fix: strip # from filenames — breaks Plex scanner

Plex interprets # as a URL fragment delimiter, causing files with # in
the name to be silently skipped during library scans.

- Added # to FORBIDDEN_CHARS in file-organizer.ts sanitizer
- Bulk-renamed 100 existing files on disk
- Updated 100 filePath records in DB to match

src/services/file-organizer.ts

@@ -5,7 +5,7 @@ import { existsSync } from 'node:fs';
 // ── Constants ──
 
 /** Characters forbidden in filenames across Windows, macOS, and Linux. */
-const FORBIDDEN_CHARS = /[/\\:*?"<>|]/g;
+const FORBIDDEN_CHARS = /[/\\:*?"<>|#]/g;
 
 /** Control characters (0x00–0x1F). */
 const CONTROL_CHARS = /[\x00-\x1f]/g;