perf(web): self-host Font Awesome instead of cdnjs CDN

Replace the external cdnjs.cloudflare.com <link> with a bundled
npm import so FA CSS+fonts ship as static assets through the
same Cloudflare CDN that serves the app — eliminates an extra
DNS lookup and third-party CDN dependency, improves reliability
for China users.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      '@fortawesome/fontawesome-free':
+        specifier: 6.5.1
+        version: 6.5.1
       '@supabase/ssr':
         specifier: ^0.12
         version: 0.12.0(@supabase/supabase-js@2.108.1)
@@ -1003,6 +1006,10 @@ packages:
     cpu: [x64]
     os: [win32]
 
+  '@fortawesome/fontawesome-free@6.5.1':
+    resolution: {integrity: sha512-CNy5vSwN3fsUStPRLX7fUYojyuzoEMSXPl7zSLJ8TgtRfjv24LOnOWKT2zYwaHZCJGkdyRnTmstR0P+Ah503Gw==}
+    engines: {node: '>=6'}
+
   '@img/colour@1.1.0':
     resolution: {integrity: sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==}
     engines: {node: '>=18'}
@@ -3893,6 +3900,8 @@ snapshots:
   '@esbuild/win32-x64@0.28.1':
     optional: true
 
+  '@fortawesome/fontawesome-free@6.5.1': {}
+
   '@img/colour@1.1.0': {}
 
   '@img/sharp-darwin-arm64@0.33.5':