refactor: update local login method icons (#6783)

#### What type of PR is this?

/area core
/kind improvement
/milestone 2.20.x

#### What this PR does / why we need it:

更新本地登录方式的图标。

<img width="514" alt="image" src="https://github.com/user-attachments/assets/d8624548-c1b1-4f26-bf2f-353f127af7e5">


#### Which issue(s) this PR fixes:

Fixes https://github.com/halo-dev/halo/issues/6759

#### Does this PR introduce a user-facing change?

```release-note
None
```

application/src/main/resources/extensions/authproviders.yaml

@@ -10,9 +10,9 @@ metadata:
 spec:
   displayName: Local
   description: Built-in authentication for Halo.
-  logo: /images/logo.png
+  logo: /images/login-methods/login-with-credentials.svg
   website: https://www.halo.run
   authenticationUrl: /login
   method: post
   rememberMeSupport: true
-  authType: form
+  authType: form

application/src/main/resources/static/images/login-methods/login-with-credentials.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="rgba(75,85,99,1)"><path d="M3 4.99509C3 3.89323 3.89262 3 4.99509 3H19.0049C20.1068 3 21 3.89262 21 4.99509V19.0049C21 20.1068 20.1074 21 19.0049 21H4.99509C3.89323 21 3 20.1074 3 19.0049V4.99509ZM5 5V19H19V5H5ZM7.97216 18.1808C7.35347 17.9129 6.76719 17.5843 6.22083 17.2024C7.46773 15.2753 9.63602 14 12.1022 14C14.5015 14 16.6189 15.2071 17.8801 17.0472C17.3438 17.4436 16.7664 17.7877 16.1555 18.0718C15.2472 16.8166 13.77 16 12.1022 16C10.3865 16 8.87271 16.8641 7.97216 18.1808ZM12 13C10.067 13 8.5 11.433 8.5 9.5C8.5 7.567 10.067 6 12 6C13.933 6 15.5 7.567 15.5 9.5C15.5 11.433 13.933 13 12 13ZM12 11C12.8284 11 13.5 10.3284 13.5 9.5C13.5 8.67157 12.8284 8 12 8C11.1716 8 10.5 8.67157 10.5 9.5C10.5 10.3284 11.1716 11 12 11Z"></path></svg>