feat(branding): update UltiAI branding and configuration

- Added WEBUI_NAME variable to .env.example and Docker Compose for consistent branding.
- Enhanced Nginx configuration with sub_filters to replace 'Open WebUI' with 'UltiAI' in responses.
- Introduced custom CSS for UltiAI branding and added logo and favicon assets.
- Implemented routing adjustments in Nginx to support SPA navigation without prefix issues.

.env.example

@@ -178,6 +178,7 @@ WEBUI_SECRET_KEY=changeme-openwebui-dev-secret
 AI_GATEWAY_API_KEY=ulti-gateway
 # OpenWebUI embed : modèles ultid visibles sans entrée DB par modèle
 BYPASS_MODEL_ACCESS_CONTROL=true
+WEBUI_NAME=UltiAI
 AI_ASSISTANT_PUBLIC_PATH=/ai
 ULTIMAIL_MCP_URL=http://ultimail-mcp:3100
 # OpenWebUI utilise POSTGRES_USER/POSTGRES_PASSWORD (base openwebui créée dans init-db.sh)

deploy/nginx/default.conf.template

@@ -383,6 +383,11 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
         proxy_set_header Upgrade $http_upgrade;
         proxy_set_header Connection $connection_upgrade;
+        proxy_set_header Accept-Encoding "";
+        sub_filter_once off;
+        sub_filter_types application/json text/plain;
+        sub_filter 'UltiAI (Open WebUI)' 'UltiAI';
+        sub_filter 'Open WebUI' 'UltiAI';
         proxy_read_timeout 86400s;
         proxy_send_timeout 86400s;
     }
@@ -643,6 +648,20 @@ server {
         # SvelteKit base path — without this, /ai/ routes 404 (base "" expects site root)
         sub_filter 'base: ""' 'base: "/ai"';
         sub_filter "base: ''" 'base: "/ai"';
+        # In-app links that escape to site root (e.g. "Nouvelle conversation" → /)
+        sub_filter 'href="/"' 'href="/ai/"';
+        sub_filter "href='/'" "href='/ai/'";
+        sub_filter 'href="/notes' 'href="/ai/notes';
+        sub_filter 'href="/workspace' 'href="/ai/workspace';
+        sub_filter 'href="/home' 'href="/ai/home';
+        sub_filter 'href="/c/' 'href="/ai/c/';
+        sub_filter 'href="/automations' 'href="/ai/automations';
+        sub_filter 'href="/calendar' 'href="/ai/calendar';
+        sub_filter 'href="/channels' 'href="/ai/channels';
+        sub_filter 'href="/playground' 'href="/ai/playground';
+        # UltiAI branding (WEBUI_NAME env still appends " (Open WebUI)" in backend)
+        sub_filter 'UltiAI (Open WebUI)' 'UltiAI';
+        sub_filter 'Open WebUI' 'UltiAI';
     }
 
     location = /ai {
@@ -692,6 +711,10 @@ server {
         sub_filter_types application/javascript text/javascript;
         sub_filter '"/api/' '"/ai/api/';
         sub_filter "'/api/" "'/ai/api/";
+        sub_filter 'href="/"' 'href="/ai/"';
+        sub_filter "href='/'" "href='/ai/'";
+        sub_filter 'Open WebUI' 'UltiAI';
+        sub_filter 'UltiAI (Open WebUI)' 'UltiAI';
     }
 
     location ^~ /_app/ {
@@ -718,6 +741,10 @@ server {
         sub_filter_types application/javascript text/javascript application/json;
         sub_filter '"/api/' '"/ai/api/';
         sub_filter "'/api/" "'/ai/api/";
+        sub_filter 'href="/"' 'href="/ai/"';
+        sub_filter "href='/'" "href='/ai/'";
+        sub_filter 'Open WebUI' 'UltiAI';
+        sub_filter 'UltiAI (Open WebUI)' 'UltiAI';
     }
 
     location = /manifest.json {
@@ -1002,6 +1029,12 @@ server {
         proxy_set_header X-Forwarded-Proto $scheme;
     }
 
+    # OpenWebUI SPA routes without /ai prefix (client nav + hard reload in UltiAI iframe).
+    # Do not include "auth" — Ultimail OIDC uses /auth/application/o/… (Authentik).
+    location ~ ^/(notes|workspace|c|home|automations|calendar|channels|playground|watch|s|error)(/|$) {
+        return 302 /ai$uri$is_args$args;
+    }
+
     location / {
         default_type text/plain;
         return 404 "Not found\n";

deploy/openwebui/docker-compose.openwebui.yml

@@ -11,6 +11,7 @@ services:
       ENABLE_PERSISTENT_CONFIG: "false"
       ENABLE_DIRECT_CONNECTIONS: "false"
       BYPASS_MODEL_ACCESS_CONTROL: "true"
+      WEBUI_NAME: UltiAI
       OPENAI_API_BASE_URL: http://ultid:8080/api/v1/ai
       OPENAI_API_KEY: ${AI_GATEWAY_API_KEY:-ulti-gateway}
       WEBUI_URL: http://${DOMAIN:-localhost}/ai
@@ -20,6 +21,9 @@ services:
     volumes:
       - openwebui_data:/app/backend/data
       - ../services/openwebui/pipelines:/app/pipelines/custom:ro
+      - ../services/openwebui/static/logo.png:/app/backend/open_webui/static/logo.png:ro
+      - ../services/openwebui/static/favicon.png:/app/backend/open_webui/static/favicon.png:ro
+      - ../services/openwebui/static/custom.css:/app/backend/open_webui/static/custom.css:ro
     networks:
       - ulti-net
     depends_on:

services/openwebui/static/custom.css

@@ -0,0 +1,4 @@
+/* UltiAI branding overrides (OpenWebUI custom.css hook) */
+:root {
+  --ultiai-brand: #1a73e8;
+}

services/openwebui/static/ultiai-mark.svg

@@ -0,0 +1,15 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 40 40" fill="none" aria-hidden="true">
+  <!-- UltiAI: sparkle 4 quadrants plats (ordre UltiDrive) + sparkle secondaire jaune -->
+  <defs>
+    <clipPath id="uai-spark">
+      <path d="M17 3c.9 7.4 2.5 10.8 4.7 13s5.6 3.8 13 4.7c-7.4.9-10.8 2.5-13 4.7s-3.8 5.6-4.7 13c-.9-7.4-2.5-10.8-4.7-13s-5.6-3.8-13-4.7c7.4-.9 10.8-2.5 13-4.7S16.1 10.4 17 3z"/>
+    </clipPath>
+  </defs>
+  <g clip-path="url(#uai-spark)">
+    <rect x="0" y="0" width="17" height="20.7" fill="#EA4335"/>
+    <rect x="17" y="0" width="23" height="20.7" fill="#4285F4"/>
+    <rect x="0" y="20.7" width="17" height="20" fill="#FBBC04"/>
+    <rect x="17" y="20.7" width="23" height="20" fill="#34A853"/>
+  </g>
+  <path fill="#FBBC04" d="M31.5 2c.5 3.6 1.2 5.3 2.3 6.4 1.1 1.1 2.8 1.8 6.4 2.3-3.6.5-5.3 1.2-6.4 2.3-1.1 1.1-1.8 2.8-2.3 6.4-.5-3.6-1.2-5.3-2.3-6.4-1.1-1.1-2.8-1.8-6.4-2.3 3.6-.5 5.3-1.2 6.4-2.3 1.1-1.1 1.8-2.8 2.3-6.4z"/>
+</svg>