[FE-TYPE-007] fe-type: Add type definitions for form data
- Created comprehensive form data types (forms.ts):
* Authentication: LoginFormData, RegisterFormData, ForgotPasswordFormData, ResetPasswordFormData
* Profile: ProfileFormData
* Content: PlaylistFormData, TrackUploadFormData, TrackEditFormData, CommentFormData
* Utility: SearchFormData, SettingsFormData, ContactFormData, FeedbackFormData
* Actions: ReportFormData, ShareFormData, InviteFormData, BulkActionFormData
* Import/Export: ImportFormData, ExportFormData
* Generic: FormField, FormState, FormValidationResult
- All types use Zod schema inference where applicable
- Ensures type safety for all form inputs and validation
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