fix : import math in main_routes to prevent NameError in explore route pagination

[tmdeveloper007]

Summary of What Has Been Done

Added the missing import math statement to src/routes/main_routes.py. The explore route uses math.ceil() for pagination calculations (line 116) but math was never imported, causing a NameError at runtime.

Changes Made

• 1 file changed, 1 insertion

Impact it Made

• Explore pagination route now works without NameError
• Users can browse paginated project listings correctly

Closes #1481

Note

Please assign this PR to the tmdeveloper007 account.

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