feat(all): add hunting and events, commerce and rewards, binary calendars, GameData caching and login diagnostics

Implement hunting AP and progress, event tasks, exchanges, games, stories and actions; connect battle and reward handling.

Add CashShop plugin and installation, server purchases and entitlements, recharge rules and plugin version metadata.

Distribute binary calendars independently; cache GameData in memory and fix single-connection query deadlocks.

Improve automatic login and recovery diagnostics; document configuration and release flows.

go/internal/server/eventgames/validation.go

@@ -0,0 +1,87 @@
+package eventgames
+
+import (
+	"bd2server/internal/server/gamedata"
+	"fmt"
+	"strconv"
+)
+
+func validateSaved(key string, g GameState, d *gamedata.EventGame) error {
+	if key != strconv.FormatUint(g.UID, 10) || g.ID != d.ID || g.Type != d.Type {
+		return fmt.Errorf("eventgames: invalid saved identity")
+	}
+	if g.Type == 12 {
+		if g.Position >= uint64(len(d.Cells)) {
+			return fmt.Errorf("eventgames: invalid saved position")
+		}
+		return nil
+	}
+	if g.Type == 19 {
+		if g.Free > d.Free || g.SinceSpecial > g.Tries {
+			return fmt.Errorf("eventgames: invalid saved roulette counters")
+		}
+		return nil
+	}
+	expected := 0
+	for _, r := range d.Cells {
+		if r.Count == rewardCount(d, g.Clear) {
+			expected++
+		}
+	}
+	if len(g.Board) != expected || expected == 0 {
+		return fmt.Errorf("eventgames: saved board size differs from design")
+	}
+	if g.Type == 13 && (d.Columns == 0 || uint64(expected) != d.Columns*d.Columns) {
+		return fmt.Errorf("eventgames: invalid bingo board dimensions")
+	}
+	seen := map[uint64]bool{}
+	for _, id := range g.Board {
+		if seen[id] {
+			return fmt.Errorf("eventgames: duplicate saved board tile")
+		}
+		seen[id] = true
+		found := false
+		for _, r := range d.Cells {
+			if r.ID == id && r.Count == rewardCount(d, g.Clear) {
+				found = true
+				break
+			}
+		}
+		if !found {
+			return fmt.Errorf("eventgames: saved tile outside design")
+		}
+	}
+	seen = map[uint64]bool{}
+	for _, id := range g.Opened {
+		if seen[id] || g.Type == 13 && id >= uint64(len(g.Board)) || g.Type == 17 && !contains(g.Board, id) {
+			return fmt.Errorf("eventgames: invalid saved open tile")
+		}
+		seen[id] = true
+	}
+	lineSeen := map[uint64]bool{}
+	for _, key := range g.Lines {
+		if lineSeen[key] {
+			return fmt.Errorf("eventgames: duplicate saved line")
+		}
+		lineSeen[key] = true
+		found := false
+		for _, r := range d.Lines {
+			if g.Type == 13 && r.Count == rewardCount(d, g.Clear) && key == r.LineType*1000+r.LineIndex && completeLine(&g, d.Columns, r.LineType, r.LineIndex) {
+				found = true
+			}
+		}
+		for _, r := range d.Complete {
+			if g.Type == 17 && r.Count == g.Clear && r.ID == key {
+				all := true
+				for _, id := range r.Members {
+					all = all && contains(g.Opened, id)
+				}
+				found = all
+			}
+		}
+		if !found {
+			return fmt.Errorf("eventgames: saved completed line invalid")
+		}
+	}
+	return nil
+}