Add minify build script and generate .min CSS/JS; rename position to brand-aside

Build tooling:
- Add package.json with clean-css and terser dev dependencies
- Add scripts/minify.js: reads joomla.asset.json, auto-detects source/.min
  pairs, and minifies all template-owned CSS and JS files
- Add node_modules/ to .gitignore

Generated .min files (all 6 manifest pairs):
- css/template.min.css      (17.8% saved)
- css/editor.min.css        (49.4% saved)
- css/theme/light.standard.min.css  (13.1% saved)
- css/theme/dark.standard.min.css   (14.4% saved)
- js/template.min.js        (58.2% saved)
- js/gtm.min.js             (62.3% saved)

Rename: header-aside → brand-aside (position, CSS class, language keys)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/media/css/editor.min.css

@@ -0,0 +1 @@
+@charset "UTF-8";body{font-size:1rem;font-weight:400;line-height:1.5;color:#22262a;background-color:#fff}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem;font-weight:700;line-height:1.2}h1{font-size:calc(1.375rem + 1.5vw)}h2{font-size:calc(1.325rem + .9vw)}h3{font-size:calc(1.3rem + .6vw)}h4{font-size:calc(1.275rem + .3vw)}h5{font-size:1.25rem}h6{font-size:1rem}a{text-decoration:none}a:link{color:#224faa}a:hover{color:#424077}p{margin-top:0;margin-bottom:1rem}hr#system-readmore{color:red;border:1px dashed red}span[lang]{padding:2px;border:1px dashed #bbb}span[lang]:after{font-size:smaller;color:red;vertical-align:super;content:attr(lang)}

src/media/css/template.css

@@ -14385,7 +14385,7 @@ fieldset>* {
 	width: 100%;
 }
 
-.container-header-aside {
+.container-brand-aside {
 	margin-inline-start: auto;
 	display: flex;
 	align-items: center;