Fix division by zero error in ClinicActivityDataService-created-by-agentic

[asafchen-dig]

An ArithmeticException is occurring in the ClinicActivityDataService.getActiveLogsRatio method due to a division by zero error when there are no logs for a given type.

Problem:
The method currently performs division without checking if the divisor (total number of logs) is zero, which causes an ArithmeticException.

Solution:
A fix has been implemented in PR #88 that:

1. Adds input validation to check for zero divisor
2. Returns 0 when no logs exist
3. Adds debug logging to track values
4. Converts the ratio to a percentage for better readability

Impact:
This error affects the clinic activity monitoring functionality and could cause service disruption when attempting to calculate ratios for activity types with no logs.

Testing:
The fix has been tested with:

• Zero logs scenario
• Normal operation scenario
• Edge cases

Related PR: #88