♻️ 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

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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/tsconfigs/strictest.json

@@ -1,24 +0,0 @@
-{
-  "$schema": "https://json.schemastore.org/tsconfig",
-  "extends": "./strict.json",
-  "compilerOptions": {
-    // Report errors for fallthrough cases in switch statements
-    "noFallthroughCasesInSwitch": true,
-    // Force functions designed to override their parent class to be specified as `override`.
-    "noImplicitOverride": true,
-    // Force functions to specify that they can return `undefined` if a possible code path does not return a value.
-    "noImplicitReturns": true,
-    // Report an error when a variable is declared but never used.
-    "noUnusedLocals": true,
-    // Report an error when a parameter is declared but never used.
-    "noUnusedParameters": true,
-    // Force the usage of the indexed syntax to access fields declared using an index signature.
-    "noUncheckedIndexedAccess": true,
-    // Report an error when the value `undefined` is given to an optional property that doesn't specify `undefined` as a valid value.
-    "exactOptionalPropertyTypes": true,
-    // Report an error for unreachable code instead of just a warning.
-    "allowUnreachableCode": false,
-    // Report an error for unused labels instead of just a warning.
-    "allowUnusedLabels": false
-  }
-}