Implement multi-stage Docker build with security hardening, add health check endpoint, optimize in-memory search with O(1) wikilink lookup, extract inline tags from markdown content, and enhance documentation with architecture diagrams and performance metrics

frontend/index.html

@@ -157,7 +157,7 @@
       <div class="sidebar-overlay" id="sidebar-overlay"></div>
 
       <!-- Sidebar -->
-      <aside class="sidebar" id="sidebar">
+      <aside class="sidebar" id="sidebar" role="navigation" aria-label="Navigation des vaults">
         <div class="sidebar-tree" id="sidebar-tree">
           <!-- Sidebar filter -->
           <div class="sidebar-filter">
@@ -190,7 +190,7 @@
             <i data-lucide="chevron-down" style="width:16px;height:16px"></i>
           </button>
           <div class="sidebar-panel-content" id="vault-panel-content">
-            <div id="vault-tree"></div>
+            <div id="vault-tree" role="tree" aria-label="Arborescence des fichiers"></div>
           </div>
         </div>
 
@@ -212,8 +212,8 @@
       <div class="sidebar-resize-handle" id="sidebar-resize-handle"></div>
 
       <!-- Content -->
-      <main class="content-area" id="content-area">
-        <div class="welcome" id="welcome">
+      <main class="content-area" id="content-area" aria-label="Contenu principal">
+        <div class="welcome" id="welcome" role="status">
           <i data-lucide="library" style="width:48px;height:48px;color:var(--text-muted)"></i>
           <h2>ObsiGate</h2>
           <p>Sélectionnez un fichier dans la sidebar ou utilisez la recherche pour commencer.</p>