feat: add credo and dialyxir for code linting and static type checking

- Add lint alias to run credo --strict and dialyzer
- Add credo and dialyxir as dev/test dependencies
- Update .gitignore to exclude dialyzer PLT files

Author: GSMLG-BOT

.gitignore

@@ -15,3 +15,8 @@ bun.lockb
 bun.lock
 .devenv/
 .devenv.flake.nix
+
+# Dialyzer
+/*.plt
+/*.plt.hash
+.dialyzer_plt

mix.exs

@@ -47,7 +47,9 @@ defmodule Phoenix.ReactServer.Mixfile do
       {:phoenix_html, "~> 4.1"},
       {:phoenix_live_view, "~> 1.0"},
       {:file_system, "~> 1.0"},
-      {:ex_doc, ">= 0.0.0", only: :dev, runtime: false}
+      {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},
+      {:credo, "~> 1.7", only: [:dev, :test], runtime: false},
+      {:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false}
     ]
   end
 
@@ -64,6 +66,8 @@ defmodule Phoenix.ReactServer.Mixfile do
   end
 
   defp aliases do
-    []
+    [
+      lint: ["credo --strict", "dialyzer"]
+    ]
   end
 end