Implement automated scheduled publishing for blog

- Enhanced blog library to read from both posts/ and scheduled/ directories
- Added publishDate filtering with real-time checking (no cron jobs needed)
- Support for draft posts and recursive directory scanning
- Posts automatically appear when publishDate is reached
- Containerized solution that works without external scheduling
- Added publishDate field to blog types and updated existing scheduled post

Tested and verified:
✅ Past-dated posts appear automatically
✅ Future-dated posts remain hidden until publish time
✅ Draft posts are excluded regardless of date
✅ Maintains existing functionality for regular posts

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

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

Dockerfile

@@ -15,12 +15,13 @@ RUN npm ci --only=production
 # Rebuild the source code only when needed
 FROM base AS builder
 WORKDIR /app
-COPY --from=deps /app/node_modules ./node_modules
+COPY package.json package-lock.json* ./
+RUN npm ci
 COPY . .
 
 # Set build-time environment variables
-ENV NEXT_TELEMETRY_DISABLED 1
-ENV NODE_ENV production
+ENV NEXT_TELEMETRY_DISABLED=1
+ENV NODE_ENV=production
 
 # Build the application
 RUN npm run build
@@ -29,8 +30,8 @@ RUN npm run build
 FROM base AS runner
 WORKDIR /app
 
-ENV NODE_ENV production
-ENV NEXT_TELEMETRY_DISABLED 1
+ENV NODE_ENV=production
+ENV NEXT_TELEMETRY_DISABLED=1
 
 # Create non-root user
 RUN addgroup --system --gid 1001 nodejs
@@ -47,9 +48,9 @@ RUN chown -R nextjs:nodejs /app/posts /app/scheduled
 
 USER nextjs
 
-EXPOSE 3000
+EXPOSE 3025
 
-ENV PORT 3000
-ENV HOSTNAME "0.0.0.0"
+ENV PORT=3025
+ENV HOSTNAME="0.0.0.0"
 
-CMD ["node", "server.js"]
+CMD ["node", "server.js"]