feat(build): add JavaScript minification support and use minified loading.js

- Add `minify-js` target to Makefile that minifies JavaScript files in internal/
- Update `build` and `run` targets to run minification before building/running
- Replace `html/loading.js` embed with `html/loading-min.js` in loading_page.go

This change optimizes the loading page performance by embedding minified JavaScript
instead of the full source file. The Makefile now automatically generates minified
versions of JavaScript files during build and run operations.

Makefile

@@ -117,12 +117,21 @@ mod-tidy:
 		cd ${PWD}/$$path && go mod tidy; \
 	done
 
-build:
+minify-js:
+	for file in $$(find internal/ -name '*.js' | grep -v -- '-min\.js$$'); do \
+		ext="$${file##*.}"; \
+		base="$${file%.*}"; \
+		min_file="$${base}-min.$$ext"; \
+		echo "minifying $$file -> $$min_file"; \
+		bunx --bun uglify-js $$file --compress --mangle --output $$min_file; \
+	done
+
+build: minify-js
 	mkdir -p $(shell dirname ${BIN_PATH})
 	go build -C ${PWD} ${BUILD_FLAGS} -o ${BIN_PATH} ./cmd
 	${POST_BUILD}
 
-run:
+run: minify-js
 	cd ${PWD} && [ -f .env ] && godotenv -f .env go run ${BUILD_FLAGS} ./cmd
 
 dev:
@@ -140,9 +149,6 @@ benchmark:
 	sleep 1
 	@./scripts/benchmark.sh
 
-dev-run: build
-	cd dev-data && ${BIN_PATH}
-
 rapid-crash:
 	docker run --restart=always --name test_crash -p 80 debian:bookworm-slim /bin/cat &&\
 	sleep 3 &&\