add: opencode-database volume

zsh.add

@@ -16,6 +16,7 @@ function agent() {
         -v "$TARGET_DIR:/workspace" \
         -v "$HOME/dev/ai/opencode.cfg:/root/.config/opencode" \
         -v "$HOME/git/mcp:/root/mcp" \
+        -v opencode-database:/root/.local/share/opencode" \
         -v opencode-cargo-cache:/root/.cargo \
         -v opencode-go-cache:/root/go \
         -v opencode-bun-cache:/root/.bun \