normalize project structure: src/client + src/server + src/shared

- restructure from src/ + server/ to src/client/ + src/server/ + src/shared/
- switch backend runtime from Node (tsx) to Bun
- merge server/package.json into root, remove @hono/node-server + tsx
- convert server @/ imports to relative paths
- standardize biome config (lineWidth 80, quoteStyle double)
- add CLAUDE.md, .env.example at root
- update vite.config, tsconfig, deploy.sh for new structure

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

deploy.sh

@@ -3,7 +3,7 @@
 # Usage: ./deploy.sh [uberspace-user@host]  (default: serve)
 set -euo pipefail
 
-# activate mise so tool versions (bun, node, etc.) from .mise.toml are on $PATH
+# activate mise so tool versions (bun, etc.) from .mise.toml are on $PATH
 eval "$(mise activate bash --shims)"
 
 REMOTE="${1:-serve}"
@@ -38,18 +38,21 @@ rsync -avz --delete -e "ssh -S $SSH_SOCK" \
 echo "==> Deploying backend to $REMOTE:$REMOTE_SERVICE_DIR"
 r "mkdir -p $REMOTE_SERVICE_DIR"
 rsync -avz --delete -e "ssh -S $SSH_SOCK" \
-	--exclude='node_modules/' \
+	--exclude='.git/' \
 	--exclude='.env' \
-	"$LOCAL_DIR/server/" "$REMOTE:$REMOTE_SERVICE_DIR/"
+	--exclude='dist/' \
+	--exclude='node_modules/' \
+	--exclude='.DS_Store' \
+	"$LOCAL_DIR/" "$REMOTE:$REMOTE_SERVICE_DIR/"
 
 echo "==> Installing backend dependencies"
-r "cd $REMOTE_SERVICE_DIR && npm install"
+r "cd $REMOTE_SERVICE_DIR && bun install"
 
 echo "==> Checking .env exists"
 r "test -f $REMOTE_SERVICE_DIR/.env || { echo 'ERROR: $REMOTE_SERVICE_DIR/.env not found — create it first'; exit 1; }"
 
 echo "==> Running database migrations"
-r "cd $REMOTE_SERVICE_DIR && set -a && source .env && set +a && npx drizzle-kit migrate"
+r "cd $REMOTE_SERVICE_DIR && set -a && source .env && set +a && bunx drizzle-kit migrate"
 
 # --- systemd user service (Uberspace 8) ---
 
@@ -63,7 +66,7 @@ After=network.target postgresql.service
 Type=simple
 WorkingDirectory=$REMOTE_SERVICE_DIR
 EnvironmentFile=$REMOTE_SERVICE_DIR/.env
-ExecStart=$REMOTE_SERVICE_DIR/node_modules/.bin/tsx src/index.ts
+ExecStart=/usr/bin/bun run src/server/index.ts
 Restart=on-failure
 RestartSec=5