fix: Resolve bcrypt architecture and duplicate resource creation issues

Backend fixes:
- Fix bcrypt exec format error for ARM64 architecture
- Add architecture detection for MinIO client download
- Install build tools and rebuild bcrypt from source
- Add postinstall script to automatically rebuild bcrypt
- Rebuild bcrypt after copying files to ensure correct binary

Frontend fixes:
- Handle duplicate resource creation in QuickStartWizard
- Add error handling for "already exists" scenarios
- Prevent multiple executions with isCreating flag
- Allow wizard to complete even if resources already exist

These changes fix:
1. Backend crash on ARM64 due to bcrypt binary mismatch
2. 500 errors when resources already exist in QuickStartWizard
3. Race conditions when clicking Complete button multiple times

🤖 Generated with [Claude Code](https://claude.ai/code)

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

docker/Dockerfile.backend

@@ -1,7 +1,8 @@
 FROM node:20-alpine
 
-# Install MinIO client
-RUN wget https://dl.min.io/client/mc/release/linux-amd64/mc && \
+# Install MinIO client (detect architecture)
+RUN ARCH=$(uname -m | sed 's/x86_64/amd64/g' | sed 's/aarch64/arm64/g') && \
+    wget https://dl.min.io/client/mc/release/linux-${ARCH}/mc && \
     chmod +x mc && \
     mv mc /usr/local/bin/
 
@@ -11,12 +12,19 @@ WORKDIR /app
 # Copy package files
 COPY package*.json ./
 
-# Install production dependencies
+# Install build tools for native dependencies (keep them)
+RUN apk add --no-cache python3 make g++ \
+    && rm -rf /app/node_modules
+
+# Install production dependencies (will trigger postinstall)
 RUN npm ci --only=production
 
 # Copy application files
 COPY . .
 
+# Rebuild bcrypt after copying files
+RUN npm rebuild bcrypt --build-from-source
+
 # Create non-root user
 RUN addgroup -g 1001 -S nodejs && \
     adduser -S nodejs -u 1001