Manage Live API Model Offset / Count / timeframe split correctly and more memory efficient

[sgiehl]

Description

Try to fix the Live API to:

• handle the offset correctly
• only count necessary data from offset (memory efficient)
• split dates into multiple queries created overlapping timeframes

• More offset corrections

Fixes #23342

Checklist

• [✔] I have understood, reviewed, and tested all AI outputs before use
• [✔] All AI instructions respect security, IP, and privacy rules

Review

• Functional review done
• Potential edge cases thought about (behaviour of the code with strange input, with strange internal state or possible interactions with other Matomo subsystems)
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done
• Wording review done
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• New documentation added or existing documentation updated