feat: add explicit sidebar placement control and responsive design (1024-1280px)

- Add sidebar field to SkillCategory model for explicit left/right control
- Update splitSkills to respect sidebar field instead of automatic splitting
- Add responsive CSS for 1024-1280px: collapse labels, icons-only buttons, EN/ES language selector
- Remove language switcher animations
- Ensure desktop view (>1280px) always shows full sidebar content
- Move Databases and Infrastructure to right sidebar
- Reduce font sizes in responsive range
- Update project logos (Lidering, Jorpack, Delivery Bikes)

internal/models/cv.go

@@ -89,6 +89,7 @@ type SkillCategory struct {
 	Category    string   `json:"category"`
 	Proficiency int      `json:"proficiency"`
 	Items       []string `json:"items"`
+	Sidebar     string   `json:"sidebar"` // "left" or "right"
 }
 
 type Language struct {