feat(API): add new api for use in another project

public/.htaccess

@@ -8,5 +8,10 @@ RewriteCond %{REQUEST_METHOD} GET [OR]
 RewriteCond %{REQUEST_METHOD} POST
 RewriteRule ^view/([a-f0-9]+)/?$ view.php?id=$1 [L,QSA]
 
+# REST API routes
+RewriteRule ^api/paste/([a-f0-9]+)/unlock/?$ api.php?id=$1&action=unlock [L,QSA]
+RewriteRule ^api/paste/([a-f0-9]+)/?$ api.php?id=$1&action=get [L,QSA]
+RewriteRule ^api/paste/?$ api.php?action=create [L,QSA]
+
 # Block direct access to .env and sensitive files
 RewriteRule ^(\.env|\.git) - [F,L]