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Fix a typo in the geometry problem: the condition OD was incorrectly written as √2-1 and is corrected to √2+1 in content/post/exam/contests/2025…/paper/index.md (problem 9.1). This updates the stated necessary and sufficient condition for CE ⟂ AD.
Replace placeholder comments in content/post/exam/contests/.../answer.md with the sufficiency part of the geometric solution. Adds reasoning using OA·OD = 1 = OF^2, triangle similarity (△OAF ~ △OFD), angle equalities and symmetry from OC = OE = OF to conclude OD ⟂ CE. Cleans up commented-out stubs.
xieyuen
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This pr resolves #1