refactor: unify build scripts to Python 3

Makefile

@@ -1,23 +1,18 @@
-# SFCraft 文档 · 构建 / 开发入口 (跨平台)
+# SFCraft 文档 · 构建 / 开发入口 (跨平台, 脚本为 Python 3)
 #
-# Linux / macOS:   make build / make dev / make sync
-# Windows(有 make 时): 同样可用, 自动调用 PowerShell 脚本
+#   make build / make dev / make sync / make help
 #
 # 可附加 hugo 参数: make dev HUGO_ARGS="--port 1314"
+# 可指定解释器: make PY=python3 build
 
 .PHONY: help sync build dev
 
 HUGO_ARGS ?=
 
 ifeq ($(OS),Windows_NT)
-  PS := powershell -NoProfile -ExecutionPolicy Bypass -File
-  BUILD_CMD := $(PS) scripts/build.ps1
-  DEV_CMD   := $(PS) scripts/dev.ps1
-  SYNC_CMD  := $(PS) scripts/sync-items.ps1
+  PY ?= python
 else
-  BUILD_CMD := ./scripts/build.sh
-  DEV_CMD   := ./scripts/dev.sh
-  SYNC_CMD  := ./scripts/sync-items.sh
+  PY ?= python3
 endif
 
 help:
@@ -30,10 +25,10 @@ help:
 	@echo 可附加 hugo 参数: make dev HUGO_ARGS="--port 1314"
 
 sync:
-	$(SYNC_CMD)
+	$(PY) scripts/sync-items.py
 
 build:
-	$(BUILD_CMD) $(HUGO_ARGS)
+	$(PY) scripts/build.py $(HUGO_ARGS)
 
 dev:
-	$(DEV_CMD) $(HUGO_ARGS)
+	$(PY) scripts/dev.py $(HUGO_ARGS)