Profiles, Giphy, uploads, settings UI

Backend:
- Auth: split routes into RegisterPublicRoutes + RegisterProtectedRoutes
- Auth: PATCH /me for profile updates (display_name, bio, accent_color, status_text)
- Auth: Gravatar fallback for avatars on register
- DB: users table now has bio, accent_color, status_text columns
- giphy/client.go: Search() and GetTrending() against Giphy API
- upload/handlers.go: MinIO file upload + serve
- config: added GiphyConfig and MinIO config
- cmd/server: wired giphy (/gifs/search, /gifs/trending), upload (/upload), files (/files/*) routes

Frontend:
- auth store: updated User interface with new profile fields, added updateProfile()
- UserSettings.tsx: terminal-styled profile editor (display_name, bio, accent_color, status_text, avatar upload)
- GiphyPicker.tsx: terminal-styled GIF picker with search + trending
- ChatArea.tsx: integrated [GIF] button into message input
- App.tsx: imports UserSettings, added /settings route

go.mod

@@ -7,14 +7,30 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/websocket v1.5.3
 	github.com/jackc/pgx/v5 v5.10.0
+	github.com/minio/minio-go/v7 v7.2.1
 	golang.org/x/crypto v0.53.0
 )
 
 require (
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.11 // indirect
+	github.com/klauspost/crc32 v1.3.0 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/minio/crc64nvme v1.1.1 // indirect
+	github.com/minio/md5-simd v1.1.2 // indirect
+	github.com/philhofer/fwd v1.2.0 // indirect
+	github.com/rs/xid v1.6.0 // indirect
+	github.com/tinylib/msgp v1.6.1 // indirect
+	github.com/zeebo/xxh3 v1.1.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/net v0.55.0 // indirect
 	golang.org/x/sync v0.21.0 // indirect
 	golang.org/x/sys v0.46.0 // indirect
 	golang.org/x/text v0.38.0 // indirect
+	gopkg.in/ini.v1 v1.67.2 // indirect
 )