[bug] change package/project name everywhere

[hsluoyz]

need to change package/project name from "acx" to "casbin" everywhere

this will fix the below CI error: https://github.com/casbin/casbin-ex/actions/runs/20636502942/job/59262156299

Run mix hex.publish --yes
Building acx 1.9.0
  Dependencies:
    ecto_sql ~> 3.10 (app: ecto_sql)
  App: acx
  Name: acx
  Files:
    lib
    lib/acx
    lib/acx/enforcer_server.ex
    lib/acx/model
    lib/acx/model/matcher.ex
    lib/acx/model/request.ex
    lib/acx/model/config.ex
    lib/acx/model/policy_effect.ex
    lib/acx/model/policy_definition.ex
    lib/acx/model/policy.ex
    lib/acx/model/request_definition.ex
    lib/acx/persist
    lib/acx/persist/persist_adapter.ex
    lib/acx/persist/ecto_adapter.ex
    lib/acx/persist/readonly_file_adapter.ex
    lib/acx/internal
    lib/acx/internal/digraph.ex
    lib/acx/internal/operator.ex
    lib/acx/internal/role_group.ex
    lib/acx/internal/partial_range.ex
    lib/acx/internal/helpers.ex
    lib/acx/internal/parser.ex
    lib/acx/enforcer_supervisor.ex
    lib/acx/model.ex
    lib/acx/enforcer.ex
    lib/acx.ex
    .formatter.exs
    mix.exs
    README.md
    LICENSE
  Version: 1.9.0
  Build tools: mix
  Description: Casbin-Ex is a powerful and efficient open-source access control library for Elixir projects.
  Licenses: Apache-2.0
  Links: 
    Docs: https://casbin.org/docs/overview
    GitHub: https://github.com/casbin/casbin-ex
    Homepage: https://casbin.org/
  Elixir: ~> 1.13
Before publishing, please read the Code of Conduct: https://hex.pm/policies/codeofconduct
Publishing package to public repository hexpm.
Building docs...
==> earmark_parser
Compiling 2 files (.xrl)
Compiling 1 file (.yrl)
Compiling 3 files (.erl)
Compiling 47 files (.ex)
Generated earmark_parser app
==> blankable
Compiling 1 file (.ex)
Generated blankable app
==> file_system
Compiling 7 files (.ex)
Generated file_system app
==> decimal
Compiling 4 files (.ex)
Generated decimal app
==> nimble_parsec
Compiling 4 files (.ex)
warning: :crypto.strong_rand_bytes/1 defined in application :crypto is used by the current application but the current application does not depend on :crypto. To fix this, you must do one of:
  1. If :crypto is part of Erlang/Elixir, you must include it under :extra_applications inside "def application" in your mix.exs
  2. If :crypto is a dependency, make sure it is listed under "def deps" in your mix.exs
  3. In case you don't want to add a requirement to :crypto, you may optionally skip this warning by adding [xref: [exclude: [:crypto]]] to your "def project" in mix.exs
  lib/nimble_parsec.ex:447: NimbleParsec.bytes_random/1
Generated nimble_parsec app
==> bunt
Compiling 2 files (.ex)
Generated bunt app
===> Analyzing applications...
===> Compiling telemetry
==> jason
Compiling 10 files (.ex)
Generated jason app
==> db_connection
Compiling 18 files (.ex)
warning: :proc_lib.set_label/1 is undefined or private
Warning:   lib/db_connection/util.ex:32: DBConnection.Util.set_label/1
Generated db_connection app
==> recase
Compiling 15 files (.ex)
Generated recase app
==> git_hooks
Compiling 16 files (.ex)
↗ Installing git hooks...
Generated git_hooks app
==> credo
Compiling 251 files (.ex)
Generated credo app
==> ecto
Compiling 56 files (.ex)
Generated ecto app
==> makeup
Compiling 15 files (.ex)
Generated makeup app
==> makeup_elixir
Compiling 6 files (.ex)
Generated makeup_elixir app
==> makeup_erlang
Compiling 4 files (.ex)
Generated makeup_erlang app
==> ex_doc
warning: the dependency :ex_doc requires Elixir "~> 1.15" but you are running on v1.14.2
Compiling 26 files (.ex)
warning: Code.prepend_paths/1 is undefined or private. Did you mean:
      * append_path/1
      * prepend_path/1
  lib/ex_doc/cli.ex:74: ExDoc.CLI.generate/3
Generated ex_doc app
==> ecto_sql
Compiling 25 files (.ex)
Generated ecto_sql app
==> acx
Compiling 21 files (.ex)
Generated acx app
Generating docs...
warning: Closing unclosed backquotes ` at end of input
Warning:   lib/acx/enforcer_server.ex:158: (file)
View "html" docs at "doc/index.html"
warning: Closing unclosed backquotes ` at end of input
Warning:   lib/acx/enforcer_server.ex:158: (file)
View "epub" docs at "doc/acx.epub"
Publishing package...
[                         ] 0%
[                         ] 0%Publishing failed
Package with name acx already exists. Make sure you are authenticated and have permissions to publish the package.
Error: Process completed with exit code 1.