CalDAV: Support Basic auth; trim+validate UUID; deprecate query token via headers; ICS end time helper; docs+instructions updated

Dockerfile

@@ -22,8 +22,8 @@ RUN pnpm build
 # Production stage
 FROM node:22-alpine AS production
 
-# Install pnpm and su-exec
-RUN npm install -g pnpm ts-node && apk add --no-cache su-exec
+# Install pnpm and required runtime tools
+RUN npm install -g pnpm ts-node && apk add --no-cache su-exec curl
 
 # Set working directory
 WORKDIR /app