feat: split client tooling and add OAuth server login

go/internal/server/player/equipment_craft_runtime.go

@@ -0,0 +1,66 @@
+package player
+
+import (
+	"errors"
+	"fmt"
+	"math"
+)
+
+// AddTalentExperience applies the same clamp as the client: talent experience
+// may reach the cumulative threshold of the current level, but this request
+// never promotes the talent level itself.
+func (s *CharacterStore) AddTalentExperience(index, gain, maximum uint64) (Character, error) {
+	if s == nil || index == 0 || maximum == 0 {
+		return Character{}, errors.New("player: invalid talent experience update")
+	}
+	s.mu.Lock()
+	for position, current := range s.characters {
+		if current.InvenIndex != index {
+			continue
+		}
+		if current.TalentExp > maximum {
+			s.mu.Unlock()
+			return Character{}, fmt.Errorf("player: character %d talent experience exceeds current threshold", index)
+		}
+		if gain > maximum-current.TalentExp {
+			gain = maximum - current.TalentExp
+		}
+		if current.TalentExp > math.MaxUint64-gain {
+			s.mu.Unlock()
+			return Character{}, errors.New("player: talent experience overflow")
+		}
+		current.TalentExp += gain
+		next := append([]Character(nil), s.characters...)
+		next[position] = current
+		if err := s.persist(next); err != nil {
+			s.mu.Unlock()
+			return Character{}, fmt.Errorf("player: persist equipment making talent experience: %w", err)
+		}
+		s.characters = next
+		s.mu.Unlock()
+		return current, nil
+	}
+	collection := s.collection
+	s.mu.Unlock()
+	if collection == nil {
+		return Character{}, fmt.Errorf("player: unknown equipment making character %d", index)
+	}
+	current, found := collection.FindCharacter(index)
+	if !found {
+		return Character{}, fmt.Errorf("player: unknown equipment making character %d", index)
+	}
+	if current.TalentExp > maximum {
+		return Character{}, fmt.Errorf("player: character %d talent experience exceeds current threshold", index)
+	}
+	if gain > maximum-current.TalentExp {
+		gain = maximum - current.TalentExp
+	}
+	if current.TalentExp > math.MaxUint64-gain {
+		return Character{}, errors.New("player: talent experience overflow")
+	}
+	current.TalentExp += gain
+	if err := collection.UpdateCharacter(current.ID, current); err != nil {
+		return Character{}, fmt.Errorf("player: persist collection equipment making talent experience: %w", err)
+	}
+	return current, nil
+}