Extract gallery app from perso/vps into standalone project

Extracted all gallery-related files from ~/perso/vps:
- gallery.go, gallery_test.go (Go source + tests)
- templates/ (index, login, gallery HTML)
- static/style.css
- go.mod/go.sum (renamed module to github.com/kagamino/kagapics)
- Caddyfile.example (gallery-only Caddy config)
- DESIGN.md (from galery.md)

3 files changed, 138 insertions, 0 deletions

diff --git a/templates/gallery.html b/templates/gallery.html
new file mode 100644
index 0000000..4991a11
--- /dev/null
+++ b/templates/gallery.html
@@ -0,0 +1,98 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>{{.Name}}</title>
+<style>{{.CSS}}</style>
+</head>
+<body>
+<div class="container">
+<h1>📷 {{.Name}}</h1>
+
+<div class="actions">
+<a href="/" class="btn btn-back">← Back</a>
+<a href="/g/{{.Name}}/zip" class="btn">⬇ Download all as ZIP</a>
+</div>
+
+<!-- Upload -->
+<div class="upload-area" id="upload-area">
+<p>Drag & drop photos here, or <label for="file-input" class="link">browse</label></p>
+<input type="file" id="file-input" multiple accept="image/*" hidden>
+<div id="upload-progress"></div>
+</div>
+
+<!-- Gallery grid -->
+<div class="grid">
+{{range .Photos}}
+<div class="grid-item" onclick="openLightbox('/g/{{$.Name}}/photo/{{.}}')">
+<img src="/g/{{$.Name}}/{{$.ThumbPrefix}}/{{.}}" alt="{{.}}" loading="lazy">
+</div>
+{{end}}
+</div>
+{{if not .Photos}}<p class="empty">No photos yet. Upload some!</p>{{end}}
+</div>
+
+<!-- Lightbox -->
+<div id="lightbox" class="lightbox" onclick="closeLightbox()">
+<img id="lightbox-img" src="">
+<a id="lightbox-download" class="lightbox-download" download onclick="event.stopPropagation()">⬇</a>
+</div>
+
+<script>
+const galleryName = {{.Name}};
+const uploadArea = document.getElementById('upload-area');
+const fileInput = document.getElementById('file-input');
+const progress = document.getElementById('upload-progress');
+
+uploadArea.addEventListener('dragover', e => { e.preventDefault(); uploadArea.classList.add('dragover'); });
+uploadArea.addEventListener('dragleave', () => uploadArea.classList.remove('dragover'));
+uploadArea.addEventListener('drop', e => {
+	e.preventDefault();
+	uploadArea.classList.remove('dragover');
+	uploadFiles(e.dataTransfer.files);
+});
+fileInput.addEventListener('change', () => uploadFiles(fileInput.files));
+
+function uploadFiles(files) {
+	if (!files.length) return;
+	const fd = new FormData();
+	for (const f of files) fd.append('photos', f);
+
+	progress.textContent = 'Uploading ' + files.length + ' file(s)…';
+
+	const xhr = new XMLHttpRequest();
+	xhr.open('POST', '/g/' + galleryName + '/upload');
+
+	xhr.upload.onprogress = e => {
+		if (e.lengthComputable) {
+			const pct = Math.round(e.loaded / e.total * 100);
+			progress.textContent = 'Uploading… ' + pct + '%';
+		}
+	};
+	xhr.onload = () => {
+		if (xhr.status === 200) {
+			const resp = JSON.parse(xhr.responseText);
+			progress.textContent = resp.uploaded + ' file(s) uploaded ✓';
+			setTimeout(() => location.reload(), 800);
+		} else {
+			progress.textContent = 'Upload failed: ' + xhr.statusText;
+		}
+	};
+	xhr.onerror = () => { progress.textContent = 'Upload failed (network error)'; };
+	xhr.send(fd);
+}
+
+function openLightbox(src) {
+	document.getElementById('lightbox-img').src = src;
+	document.getElementById('lightbox-download').href = src;
+	document.getElementById('lightbox').classList.add('active');
+}
+function closeLightbox() {
+	document.getElementById('lightbox').classList.remove('active');
+	document.getElementById('lightbox-img').src = '';
+}
+document.addEventListener('keydown', e => { if (e.key === 'Escape') closeLightbox(); });
+</script>
+</body>
+</html>
diff --git a/templates/index.html b/templates/index.html
new file mode 100644
index 0000000..357a8a8
--- /dev/null
+++ b/templates/index.html
@@ -0,0 +1,21 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Photo Gallery</title>
+<style>{{.CSS}}</style>
+</head>
+<body>
+<div class="container">
+<h1>📷 Photo Gallery</h1>
+{{if .Names}}
+<ul class="gallery-list">
+{{range .Names}}<li><a href="/g/{{.}}">{{.}}</a></li>{{end}}
+</ul>
+{{else}}
+<p>No galleries yet.</p>
+{{end}}
+</div>
+</body>
+</html>
diff --git a/templates/login.html b/templates/login.html
new file mode 100644
index 0000000..7c06fbc
--- /dev/null
+++ b/templates/login.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>{{.Name}} — Login</title>
+<style>{{.CSS}}</style>
+</head>
+<body>
+<div class="container">
+<h1>🔒 {{.Name}}</h1>
+{{if .Error}}<p class="error">{{.Error}}</p>{{end}}
+<form method="POST" action="/g/{{.Name}}">
+<input type="password" name="password" placeholder="Password" autofocus required>
+<button type="submit">Enter</button>
+</form>
+</div>
+</body>
+</html>