feat: migrate state and complete live systems

- replace the Haskell bridge with transactional SQLite state and validation

- centralize versions and harden resource, capture, and release tooling

- complete active gacha schedules, point exchange, and mail grants

- add equipment refinement, presets, and ordinary formation workflows

- improve client plugins, request timing, and normalized persistence

go/cmd/bd2server/state_validation.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+
+	"bd2server/internal/accountstate"
+)
+
+func stateProblemsError(prefix string, problems []accountstate.Problem) error {
+	parts := make([]string, 0, len(problems))
+	for _, problem := range problems {
+		parts = append(parts, problem.Code+": "+problem.Message)
+	}
+	return fmt.Errorf("%s: %s", prefix, strings.Join(parts, "; "))
+}