chore: split plugin configuration templates

internal/admin/templates/plugins/security.domainblock.html

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+{{define "plugins/security.domainblock.html"}}
+<div class="mb-3">
+    <label class="form-label">Blocked Domains</label>
+    <input type="text" class="form-control" name="blocked_domains"
+           value="{{with .ChannelPlugin.Config}}{{index . "blocked_domains"}}{{end}}"
+           placeholder="example.com, evil.org, ads.com">
+    <div class="form-text text-muted">
+        Enter comma-separated list of domains to block (e.g., example.com, evil.org).
+        Messages containing links to these domains will be blocked.
+    </div>
+</div>
+{{end}}

internal/admin/templates/plugins/social.instagram.html

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+{{define "plugins/social.instagram.html"}}
+<div class="mb-3">
+    <label class="form-label">Replacement Domain</label>
+    <input type="text" class="form-control" name="domain"
+           value="{{with .ChannelPlugin.Config}}{{index . "domain"}}{{end}}"
+           placeholder="ddinstagram.com">
+    <div class="form-text text-muted">
+        Enter the domain to replace instagram.com links with. Default is ddinstagram.com if left empty.
+    </div>
+</div>
+{{end}}

internal/admin/templates/plugins/social.twitter.html

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+{{define "plugins/social.twitter.html"}}
+<div class="mb-3">
+    <label class="form-label">Replacement Domain</label>
+    <input type="text" class="form-control" name="domain"
+           value="{{with .ChannelPlugin.Config}}{{index . "domain"}}{{end}}"
+           placeholder="fxtwitter.com">
+    <div class="form-text text-muted">
+        Enter the domain to replace twitter.com and x.com links with. Default is fxtwitter.com if left empty.
+    </div>
+</div>
+{{end}}