[Broadcast] /announce command (Telegram)

[viganogabriele]

Parent Epic: #120

Part of #120

Implement the /announce command for creating broadcasts via Telegram.

Requirements

• Admin sends /announce command to the bot
• Bot prompts for the tag number of target groups
• Bot prompts for the message content with full formatting support:
  • Text (bold, italic, code, etc.)
  • Images/photos
  • Videos
  • Documents
  • Any supported Telegram media format
• Bot prompts for send now or schedule:
  • 'Send now' option
  • 'Schedule' option with time picker
• Bot confirms creation with summary (tag, groups count, scheduled time if any)

Technical Notes

• Handle all media types correctly (forward vs copy)
• Store announcement in database with pending status
• Trigger scheduler if a future time is selected

Labels: enhancement

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• Feature Request: Targeted message broadcasting to selected groups #79

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