fix(app): 修复 AppController 安全与查询问题

- 加强异常处理、类型安全和图片上传校验
- 优化设备相关查询，避免重复访问数据源
- 补充并记录并发测试与审查修复实施计划

tmp/hatch-pet/omen-cat/run/prompts/look-cardinals.md

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+Create one horizontal four-cardinal anchor strip for Codex pet `youmiao`.
+
+Use the attached canonical base, completed standard contact sheet, and layout guide for exact identity, style, scale, baseline, face construction, materials, palette, markings, props, and spacing. Read `qa/look-mechanics.md` and use the pet's natural gaze mechanism.
+
+Output exactly four centered complete full-body poses in this exact left-to-right order: `000 up`, `090 screen-right`, `180 down`, `270 screen-left`. Screen-left and screen-right always mean the viewer's image edges, never the character's own left or right.
+
+For `000`, keep the face broadly frontal and point the eyes and natural head mechanism toward the TOP edge. For `090`, put the nose tip, pupils, face surface, or natural aiming feature on the screen-right side of the head center. For `180`, keep the face broadly frontal and point toward the BOTTOM edge. For `270`, apply the inverse screen-left landmark rule. Every cardinal must be unmistakable without labels.
+
+Place one pose in each invisible equal-width slot on a flat pure yellow #FFFF00 background with generous padding. Keep scale, feet/base, lower body, and registration consistent across all four slots.
+
+Do not rotate, skew, or tilt the whole sprite to fake gaze. Do not add replacement eyes, labels, degree text, arrows, boxes, guide marks, shadows, scenery, detached effects, or chroma-key colors inside the pet.