feat: Add toggle to disable email verification during mining

[malek10xdev]

Summary

• Add toggle in mining settings to disable email verification during mining
• Backend automatically disables cleaning if no verification providers configured
• When disabled, extraction worker skips publishing to verification stream

Changes

• Backend: Added hasEmailVerificationConfigured(), conditional clean task creation in TaskManagers, optional stream handling in workers
• Frontend: Added toggle in MiningSettingsDialog, store state, and i18n translations

Resolves #2754

[github-actions]

Coverage Report

✅ Passed

Commit: 67c6ce4

Summary

	Name	Stmts	Branch	Funcs	Lines
🔴	Total	38.4%	34.6%	44.7%	38.5%

All files

	Name	Stmts	Branch	Funcs	Lines
🔴	backend/src/controllers/mining.controller.ts	0%	0%	0%	0%
🟢	backend/src/services/email-status/EmailStatusVerifierFactory.ts	91.4%	70%	91.7%	93%
🟡	backend/src/services/tasks-manager/TasksManager.ts	54.8%	33%	77.8%	56%
🔴	backend/src/services/tasks-manager/TasksManagerFile.ts	0%	0%	0%	0%
🔴	backend/src/services/tasks-manager/TasksManagerPST.ts	0%	0%	0%	0%
🔴	backend/src/workers/email-message/MessagesConsumer.ts	0%	0%	0%	0%
🔴	backend/src/workers/email-message/emailMessageHandlers.ts	0%	0%	0%	0%

No coverage changes

	Name	Stmts	Branch	Funcs	Lines
🔴	backend/src/controllers/mining.controller.ts	0%	0%	0%	0%
🟢	backend/src/services/email-status/EmailStatusVerifierFactory.ts	91.4%	70%	91.7%	93%
🟡	backend/src/services/tasks-manager/TasksManager.ts	54.8%	33%	77.8%	56%
🔴	backend/src/services/tasks-manager/TasksManagerFile.ts	0%	0%	0%	0%
🔴	backend/src/services/tasks-manager/TasksManagerPST.ts	0%	0%	0%	0%
🔴	backend/src/workers/email-message/MessagesConsumer.ts	0%	0%	0%	0%
🔴	backend/src/workers/email-message/emailMessageHandlers.ts	0%	0%	0%	0%

Generated by Test Coverage Reporter for commit 67c6ce4