Add APSys 2026 (#1472)

* Add APSys 2026

* Update deadlines for APSYS 2026 conference

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Co-authored-by: Zhihao Chen <jacklightchen@gmail.com>

Author: sarendis56

conference/DS/apsys.yml

@@ -26,3 +26,12 @@
       timezone: AoE
       date: October 12-13, 2025
       place: Seoul, South Korea
+    - year: 2026
+      id: apsys2026
+      link: https://ap-sys.org/
+      timeline:
+        - abstract_deadline: '2026-05-13 23:59:00'
+          deadline: '2026-05-20 23:59:00'
+      timezone: AoE
+      date: September 17-18, 2026
+      place: Bangkok, Thailand