♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
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✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/astro/dist/runtime/server/render/instruction.js

@@ -1,13 +0,0 @@
-const RenderInstructionSymbol = Symbol.for("astro:render");
-function createRenderInstruction(instruction) {
-  return Object.defineProperty(instruction, RenderInstructionSymbol, {
-    value: true
-  });
-}
-function isRenderInstruction(chunk) {
-  return chunk && typeof chunk === "object" && chunk[RenderInstructionSymbol];
-}
-export {
-  createRenderInstruction,
-  isRenderInstruction
-};