Fix ECCV 2026 conference ID typo

Corrected the conference ID from "eecv26" to "eccv26" to match the official ECCV (European Conference on Computer Vision) acronym.

Sources:
- https://eccv.ecva.net/Conferences/2026
- https://eccv.ecva.net/Conferences/2026/Dates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/data/conferences/eccv.yml

@@ -1,6 +1,6 @@
 - title: ECCV
   year: 2026
-  id: eecv26
+  id: eccv26
   full_name: European Conference on Computer Vision
   link: https://eccv.ecva.net/Conferences/2026
   city: Malmö