♻️ 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/zod-to-json-schema/dist/esm/parsers/literal.js

@@ -1,21 +0,0 @@
-export function parseLiteralDef(def, refs) {
-    const parsedType = typeof def.value;
-    if (parsedType !== "bigint" &&
-        parsedType !== "number" &&
-        parsedType !== "boolean" &&
-        parsedType !== "string") {
-        return {
-            type: Array.isArray(def.value) ? "array" : "object",
-        };
-    }
-    if (refs.target === "openApi3") {
-        return {
-            type: parsedType === "bigint" ? "integer" : parsedType,
-            enum: [def.value],
-        };
-    }
-    return {
-        type: parsedType === "bigint" ? "integer" : parsedType,
-        const: def.value,
-    };
-}