♻️ 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/prismjs/components/prism-ichigojam.min.js

@@ -1 +0,0 @@
-Prism.languages.ichigojam={comment:/(?:\B'|REM)(?:[^\n\r]*)/i,string:{pattern:/"(?:""|[!#$%&'()*,\/:;<=>?^\w +\-.])*"/,greedy:!0},number:/\B#[0-9A-F]+|\B`[01]+|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:E[+-]?\d+)?/i,keyword:/\b(?:BEEP|BPS|CASE|CLEAR|CLK|CLO|CLP|CLS|CLT|CLV|CONT|COPY|ELSE|END|FILE|FILES|FOR|GOSUB|GOTO|GSB|IF|INPUT|KBD|LED|LET|LIST|LOAD|LOCATE|LRUN|NEW|NEXT|OUT|PLAY|POKE|PRINT|PWM|REM|RENUM|RESET|RETURN|RIGHT|RTN|RUN|SAVE|SCROLL|SLEEP|SRND|STEP|STOP|SUB|TEMPO|THEN|TO|UART|VIDEO|WAIT)(?:\$|\b)/i,function:/\b(?:ABS|ANA|ASC|BIN|BTN|DEC|END|FREE|HELP|HEX|I2CR|I2CW|IN|INKEY|LEN|LINE|PEEK|RND|SCR|SOUND|STR|TICK|USR|VER|VPEEK|ZER)(?:\$|\b)/i,label:/(?:\B@\S+)/,operator:/<[=>]?|>=?|\|\||&&|[+\-*\/=|&^~!]|\b(?:AND|NOT|OR)\b/i,punctuation:/[\[,;:()\]]/};