docs(cli): remove obsolete build base examples (#466)

Author: SaKaNa-Y

docs/content/1.guide/10.standalone-cli.md

@@ -78,7 +78,6 @@ my-tool                                     # dev server at http://localhost:777
 my-tool --config ./my.config.mjs
 my-tool --port 8080 --no-open
 my-tool build --out-dir dist-static         # self-contained static deploy
-my-tool build --out-dir dist-static --base /tool/  # …under a custom base
 my-tool mcp                                 # agent exposure
 ```
 

docs/content/2.adapters/2.cac.md

@@ -31,7 +31,6 @@ await createCac(myDevframe).parse()
 my-tool                         # dev server at http://localhost:9999/
 my-tool --port 8080
 my-tool build --out-dir dist-static
-my-tool build --out-dir dist-static --base /my-tool/
 my-tool mcp                     # stdio MCP server
 ```