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

internal/db/db.go

@@ -40,10 +40,15 @@ CREATE TABLE IF NOT EXISTS users (
 	email VARCHAR(255) NOT NULL UNIQUE,
 	password_hash VARCHAR(255),
 	avatar TEXT,
+	bio VARCHAR(250) DEFAULT '',
+	accent_color VARCHAR(7) DEFAULT '',
 	status VARCHAR(16) NOT NULL DEFAULT 'offline',
+	status_text VARCHAR(128) DEFAULT '',
 	created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 
+CREATE INDEX IF NOT EXISTS idx_users_username ON users(username);
+
 CREATE TABLE IF NOT EXISTS sessions (
 	id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
 	user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,