♻️ 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/parse5/dist/tokenizer/preprocessor.d.ts

@@ -1,36 +0,0 @@
-import { ERR, type ParserError, type ParserErrorHandler } from '../common/error-codes.js';
-export declare class Preprocessor {
-    private handler;
-    html: string;
-    pos: number;
-    private lastGapPos;
-    private gapStack;
-    private skipNextNewLine;
-    lastChunkWritten: boolean;
-    endOfChunkHit: boolean;
-    bufferWaterline: number;
-    private isEol;
-    private lineStartPos;
-    droppedBufferSize: number;
-    line: number;
-    constructor(handler: {
-        onParseError?: ParserErrorHandler | null;
-    });
-    /** The column on the current line. If we just saw a gap (eg. a surrogate pair), return the index before. */
-    get col(): number;
-    get offset(): number;
-    getError(code: ERR, cpOffset: number): ParserError;
-    private lastErrOffset;
-    private _err;
-    private _addGap;
-    private _processSurrogate;
-    willDropParsedChunk(): boolean;
-    dropParsedChunk(): void;
-    write(chunk: string, isLastChunk: boolean): void;
-    insertHtmlAtCurrentPos(chunk: string): void;
-    startsWith(pattern: string, caseSensitive: boolean): boolean;
-    peek(offset: number): number;
-    advance(): number;
-    private _checkForProblematicCharacters;
-    retreat(count: number): void;
-}