feat(coderd/templatebuilder): author initial module catalog for 19 modules (#26194)

> [!NOTE]
> This PR was authored by Coder Agents on behalf of @jeremyruppel.

Runs the `scripts/modulegen` generator against the coder/registry to produce the initial module catalog for the template builder. Generates `module.json` and `.tf.tmpl` files for 19 modules across four categories:

- **IDE**: code-server, jetbrains, vscode-desktop, vscode-web, cursor, windsurf, zed, kiro
- **AI Agent**: claude-code, aider, goose, amazon-q
- **Source Control**: git-clone, git-config, git-commit-signing
- **Utility**: dotfiles, personalize, filebrowser, jupyterlab

Also updates `catalog_test.go` to validate the new embedded modules load correctly.

coderd/templatebuilder/modules/git-config/module.json

@@ -0,0 +1,44 @@
+{
+  "id": "git-config",
+  "display_name": "Git Config",
+  "description": "Stores Git configuration from Coder credentials",
+  "icon": "/icon/git.svg",
+  "category": "Source Control",
+  "tags": [
+    "helper",
+    "git"
+  ],
+  "compatible_os": [
+    "linux"
+  ],
+  "conflicts_with": [],
+  "pinned_version": "1.0.33",
+  "variables": [
+    {
+      "name": "agent_id",
+      "type": "string",
+      "description": "The ID of a Coder agent.",
+      "required": false,
+      "sensitive": false,
+      "computed": true
+    },
+    {
+      "name": "allow_email_change",
+      "type": "bool",
+      "description": "Allow developers to change their git email.",
+      "default": false,
+      "required": false,
+      "sensitive": false,
+      "computed": false
+    },
+    {
+      "name": "allow_username_change",
+      "type": "bool",
+      "description": "Allow developers to change their git username.",
+      "default": true,
+      "required": false,
+      "sensitive": false,
+      "computed": false
+    }
+  ]
+}