feat: support tailwindcss v4 (#3054)

update /www and tailwind-plugin to support tailwind v4.

Thanks to the merge of #3034, the work of integrating and advancing
#2903 is promoted.

related #3034 
related #2903 

close #3056
close #2819

--patch-1 
based on review,

1. del compiler and make it more clean and simple,
2.  fix init tailwind part,
3. fix test tailwind part

--patch-2

1. fix the docs 
2. fix the docs of plugin and version

--patch-3
1. Addressed various maintenance tasks (chores)
2. Updated the Tailwind CSS plugin to align with this release. Generated
a fresh project using the updated init configuration and
3. deployed it via Deno Deploy EA. Deployment is functioning correctly.

--patch-4
Move postcss imports to Tailwind section in init script

--patch-5
Refactored Tailwind plugin type definitions by copying PluginOptions
properties from @tailwindcss/postcss and adding Fresh-specific exclude
option, while exporting types from package entrypoint for better
accessibility.

Test Project: https://fresh.fresh-press.deno.net/
Test Project Repository:
https://github.com/SisyphusZheng/fresh-tailwindv4
Test Plugin: https://jsr.io/@freshpress/fresh-plugin-tailwind@1.0.0

---------

Co-authored-by: 李嘉图·M·路 <146103794+Ricardo-M-Zheng@users.noreply.github.com>
Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>
Co-authored-by: Marvin Hagemeister <marvin@deno.com>

Author: 3 people

deno.json

@@ -1,4 +1,5 @@
 {
+  "nodeModulesDir": "auto",
   "workspace": [
     "./examples",
     "./init",
@@ -74,14 +75,12 @@
     "@std/expect": "jsr:@std/expect@^1.0.16",
     "@std/testing": "jsr:@std/testing@^1.0.12",
 
-    "autoprefixer": "npm:autoprefixer@10.4.17",
-    "cssnano": "npm:cssnano@6.0.3",
-    "postcss": "npm:postcss@8.4.35",
-    "tailwindcss": "npm:tailwindcss@^3.4.1",
+    "@tailwindcss/postcss": "npm:@tailwindcss/postcss@^4.1.10",
+    "tailwindcss": "npm:tailwindcss@^4.1.10",
+    "postcss": "npm:postcss@8.5.6",
 
     "ts-morph": "npm:ts-morph@^25.0.1",
 
-    "@fresh/plugin-tailwind": "jsr:@fresh/plugin-tailwind@^0.0.1-alpha.7",
     "@std/front-matter": "jsr:@std/front-matter@^1.0.5",
     "github-slugger": "npm:github-slugger@^2.0.0",
     "imagescript": "https://deno.land/x/imagescript@1.3.0/mod.ts",