fix(ffi): 统一 cgo 链接与 release 构建 profile

internal/ffi/ffi.go 的 cgo LDFLAGS 硬编码 -L target/debug，而 build-rust 用
--release（产物落 target/release），干净环境下 make build/test-go/ci 必然
报 cannot find -lbat_ffi。

- LDFLAGS 指向 target/release，并加 -Wl,-rpath 让产物运行时无需 LD_LIBRARY_PATH
  即可定位 libbat_ffi.so；删除指向不存在目录的无效 CFLAGS -I（C 声明本就内联）。
- 新增 build-ffi target（cargo build --release -p bat-ffi），build-go 与 test-go
  依赖它，确保链接前 release FFI 库已存在。

验证：make build-go 成功产出并可运行 bin/bat；make test-go 链接并通过；
go vet（check-go）通过。

对应 issue #18 维护清单 1-6。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Makefile

@@ -1,4 +1,4 @@
-.PHONY: help build test clean check fmt lint install dev docker-build docker-up docker-down official-smoke
+.PHONY: help build build-ffi test clean check fmt lint install dev docker-build docker-up docker-down official-smoke
 
 # 默认目标
 .DEFAULT_GOAL := help
@@ -24,7 +24,11 @@ build-rust: ## 构建 Rust 组件
 	@echo "$(BLUE)Building Rust workspace...$(NC)"
 	cargo build --release --workspace
 
-build-go: ## 构建 Go 组件
+build-ffi: ## 构建 bat-ffi release 库（cgo 链接依赖）
+	@echo "$(BLUE)Building bat-ffi (release)...$(NC)"
+	cargo build --release -p bat-ffi
+
+build-go: build-ffi ## 构建 Go 组件
 	@echo "$(BLUE)Building Go CLI...$(NC)"
 	@if [ -f cmd/bat/main.go ]; then \
 		go build -o bin/bat ./cmd/bat; \
@@ -50,7 +54,7 @@ test-rust: ## 运行 Rust 测试
 	@echo "$(BLUE)Running Rust tests...$(NC)"
 	cargo test --workspace
 
-test-go: ## 运行 Go 测试
+test-go: build-ffi ## 运行 Go 测试
 	@echo "$(BLUE)Running Go tests...$(NC)"
 	@if [ -n "$$(go list ./... 2>/dev/null)" ]; then \
 		go test -v ./...; \

internal/ffi/ffi.go

@@ -6,8 +6,10 @@
 package ffi
 
 /*
-#cgo CFLAGS: -I${SRCDIR}/../../target/bat-ffi
+// Links against the release bat-ffi library built by `cargo build --release -p bat-ffi`
-#cgo LDFLAGS: -L${SRCDIR}/../../target/debug -lbat_ffi
+// (see the `build-ffi` Make target). The rpath lets the resulting binary locate
+// libbat_ffi.so at runtime without setting LD_LIBRARY_PATH during local development.
+#cgo LDFLAGS: -L${SRCDIR}/../../target/release -lbat_ffi -Wl,-rpath,${SRCDIR}/../../target/release
 #include <stdlib.h>
 
 typedef char* ccharp;