chore: clean up repo structure and polish docs

- Rewrite .gitignore in English with proper patterns for build artifacts, storage files, and IDE files
- Remove tracked build assets (hash-based) and storage files from git
- Update LICENSE copyright to 2026 Remco (Epicnabbo)
- Fix clone URLs in README (remove placeholder gitea-server)
- Sync docs/INSTALL.md with README installation guide

public/build/manifest.json

@@ -1,7 +1,14 @@
 {
-  "_axios-B2OU-7LW.js": {
-    "file": "assets/axios-B2OU-7LW.js",
-    "name": "axios"
+  "_axios-Bb9VWCvi.js": {
+    "file": "assets/axios-Bb9VWCvi.js",
+    "name": "axios",
+    "imports": [
+      "_chunk-QTnfLwEv.js"
+    ]
+  },
+  "_chunk-QTnfLwEv.js": {
+    "file": "assets/chunk-QTnfLwEv.js",
+    "name": "chunk"
   },
   "public/assets/images/background-dark.jpg": {
     "file": "assets/background-dark-BfkMu3-0.jpg",
@@ -104,7 +111,7 @@
     "src": "public/assets/images/profile/profile-bg.png"
   },
   "resources/css/global.css": {
-    "file": "assets/global-owlIrRiH.css",
+    "file": "assets/global-waxZ23FQ.css",
     "name": "global",
     "names": [
       "global.css"
@@ -140,16 +147,26 @@
     ]
   },
   "resources/js/global.js": {
-    "file": "assets/global-TU7mFC54.js",
+    "file": "assets/global-r22-sRCc.js",
     "name": "global",
     "src": "resources/js/global.js",
     "isEntry": true,
     "imports": [
-      "_axios-B2OU-7LW.js"
+      "_chunk-QTnfLwEv.js",
+      "_axios-Bb9VWCvi.js"
+    ]
+  },
+  "resources/js/ssr.jsx": {
+    "file": "assets/ssr-DdmZbD73.js",
+    "name": "ssr",
+    "src": "resources/js/ssr.jsx",
+    "isEntry": true,
+    "imports": [
+      "_chunk-QTnfLwEv.js"
     ]
   },
   "resources/themes/atom/css/app.css": {
-    "file": "assets/app-9mCg36im.css",
+    "file": "assets/app-BwtlzFKR.css",
     "name": "app",
     "names": [
       "app.css"
@@ -185,12 +202,13 @@
     ]
   },
   "resources/themes/atom/js/app.js": {
-    "file": "assets/app-wUWplMFd.js",
+    "file": "assets/app-CAkt-7PZ.js",
     "name": "app",
     "src": "resources/themes/atom/js/app.js",
     "isEntry": true,
     "imports": [
-      "_axios-B2OU-7LW.js"
+      "_chunk-QTnfLwEv.js",
+      "_axios-Bb9VWCvi.js"
     ],
     "css": [
       "assets/app-CeYfhhVD.css"