Add configurable auto-streak feature with daily increment and source display

[bhaskarjha-dev]

Feature Overview:

• Implement an auto streak feature. Once a user starts or resets a streak, the streak count increases by 1 every day until reset.
• Users should be able to reset the streak at any moment.
• The current streak value should be available as a source to be shown on stream (OBS Studio display).
• Consider both browser overlay and text sources for displaying the streak count. Decide which is best or allow user to choose.
• Users should be able to configure the prefix for the streak number (e.g., 'Day', 'Streak', or any custom prefix).

Requirements:

• Add feature to automatically increment streak counter daily and persist this value.
• Add option for user to reset streak (counter returns to 0 or 1).
• Provide a setting for users to set the prefix shown before the streak number.
• Present the streak as a source that can be added as overlay or text in OBS Studio (configurable).
• Update documentation to explain how to use and configure this feature.

Language/Platform:

• Main implementation in Lua (core logic)
• UI/overlay part in HTML/JavaScript if using browser sources

Benefits:

• Helps users track daily progress or habits directly on stream.
• Fully automated, minimal configuration, and customizable prefix for personal branding.

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If you have a preference for overlay type (text vs browser), please specify in a comment.