fix: déduplication SQLite AVANT upload — bloque tout doublon, même séquentiel

- Vérifie already_seen() dans la DB SQLite avant chaque upload vers Imago
- Si le hash existe déjà → retourne status=duplicate sans re-uploader
- Protège contre les doublons séquentiels (pas juste concurrents)
- Testé: 1er upload OK (ID 81), 2e upload même fichier → duplicate, 3e fichier différent → OK (ID 82)

src/frontend/changelog.html

@@ -3,7 +3,7 @@
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<title>Changelog — imagod-web v0.2.0+build.22-3254c33-dirty</title>
+<title>Changelog — imagod-web v0.2.0+build.23-5a2e12d-dirty</title>
 <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🖼️</text></svg>">
 <style>
 * { margin:0; padding:0; box-sizing:border-box; }
@@ -37,7 +37,7 @@ footer { text-align:center; color:#484f58; font-size:0.8rem; padding:2rem; }
 </head>
 <body>
 <header>
-  <h1>📋 imagod-web <span class="version-badge">v0.2.0+build.22-3254c33-dirty</span></h1>
+  <h1>📋 imagod-web <span class="version-badge">v0.2.0+build.23-5a2e12d-dirty</span></h1>
   <nav>
     <a href="/">🖼️ Galerie</a>
     <a href="/changelog" class="active">📋 Changelog</a>
@@ -107,6 +107,6 @@ footer { text-align:center; color:#484f58; font-size:0.8rem; padding:2rem; }
 <h2>Légende des tags</h2>
 
 </main>
-<footer>imagod-web v0.2.0+build.22-3254c33-dirty — <a href="https://git.dracodev.net/Projets/imagod-web">Gitea</a></footer>
+<footer>imagod-web v0.2.0+build.23-5a2e12d-dirty — <a href="https://git.dracodev.net/Projets/imagod-web">Gitea</a></footer>
 </body>
 </html>

src/frontend/help.html

@@ -3,7 +3,7 @@
 <head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
-<title>Aide & Roadmap — imagod-web v0.2.0+build.22-3254c33-dirty</title>
+<title>Aide & Roadmap — imagod-web v0.2.0+build.23-5a2e12d-dirty</title>
 <link rel="icon" href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>🖼️</text></svg>">
 <style>
 * { margin:0; padding:0; box-sizing:border-box; }
@@ -37,7 +37,7 @@ footer { text-align:center; color:#484f58; font-size:0.8rem; padding:2rem; }
 </head>
 <body>
 <header>
-  <h1>❓ imagod-web <span class="version-badge">v0.2.0+build.22-3254c33-dirty</span></h1>
+  <h1>❓ imagod-web <span class="version-badge">v0.2.0+build.23-5a2e12d-dirty</span></h1>
   <nav>
     <a href="/">🖼️ Galerie</a>
     <a href="/changelog">📋 Changelog</a>
@@ -169,6 +169,6 @@ footer { text-align:center; color:#484f58; font-size:0.8rem; padding:2rem; }
 <p>5. <strong>Corriger le backend Imago</strong> (thumbnails, upload, stockage)</p>
 
 </main>
-<footer>imagod-web v0.2.0+build.22-3254c33-dirty — <a href="https://git.dracodev.net/Projets/imagod-web">Gitea</a></footer>
+<footer>imagod-web v0.2.0+build.23-5a2e12d-dirty — <a href="https://git.dracodev.net/Projets/imagod-web">Gitea</a></footer>
 </body>
 </html>

src/frontend/index.html

@@ -465,7 +465,7 @@
         <button class="btn" id="clear-btn" style="display:none">✕</button>
     </div>
     <button class="btn accent" id="header-upload-btn" onclick="document.getElementById('drop-zone').scrollIntoView({behavior:'smooth'}); document.getElementById('file-input').click()">📤 Upload</button>
-    <span class="version-badge" id="version-badge">v0.2.0+build.22-3254c33-dirty</span>
+    <span class="version-badge" id="version-badge">v0.2.0+build.23-5a2e12d-dirty</span>
 </div>
 
 <!-- ─── Navigation ─── -->

src/server/routes.rs

@@ -227,6 +227,27 @@ async fn upload_image(
     // Calculer le hash AVANT de consommer `data` (upload_image prend ownership)
     let file_hash = crate::dedup::Dedup::hash_bytes(&data);
 
+    // ═══ Déduplication SQLite : vérifier si ce hash a déjà été uploadé ═══
+    if let Ok(dedup) = crate::dedup::Dedup::open(&state.dedup_db_path, 1000) {
+        if dedup.already_seen(&file_hash).unwrap_or(false) {
+            tracing::info!(
+                "🔄 Fichier déjà connu — hash {}... ignoré (uploadeur : {})",
+                hex::encode(&file_hash[..8.min(file_hash.len())]),
+                filename
+            );
+            return (
+                axum::http::StatusCode::OK,
+                Json(serde_json::json!({
+                    "id": null,
+                    "uuid": null,
+                    "filename": filename,
+                    "status": "duplicate",
+                    "message": "Image déjà existante (hash identique)"
+                })),
+            );
+        }
+    }
+
     // ═══ Garde anti-doublon : vérifier qu'aucun upload concurrent n'est en cours pour ce hash ═══
     {
         let mut in_flight = state.in_flight.lock().await;