feat(tools/basic): 内置基础工具（calculator(注入安全)/datetime/random/text/json/markdown）+ 批量注册

plugins/tools/basic/log.go

@@ -0,0 +1,17 @@
+package basic
+
+import (
+	"log/slog"
+
+	"git.yeij.top/AskaEth/Cyrene_v2/internal/logger"
+)
+
+// log returns a logger tagged with this plugin's source so every record it emits
+// is traceable back to its owning module (DevDocs/02-development-constraints.md
+// §五). The sdk.Tool surface does not carry an injected base logger, so a fresh
+// one is built on demand; it is only used on the error path, where the cost is
+// negligible. Errors are also returned to the caller so the failure is never
+// swallowed.
+func log() *slog.Logger {
+	return logger.WithSource(logger.New(logger.Options{}), "plugins/tools/basic")
+}