feat: build out initial prototype (#1)

### Explanation

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### Issue

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### Attestations

- [ ] I have read and agree to the [Code of Conduct](https://docs.nhcarrigan.com/community/coc/)
- [ ] I have read and agree to the [Community Guidelines](https://docs.nhcarrigan.com/community/guide/).
- [ ] My contribution complies with the [Contributor Covenant](https://docs.nhcarrigan.com/dev/covenant/).

### Dependencies

- [ ] I have pinned the dependencies to a specific patch version.

### Style

- [ ] I have run the linter and resolved any errors.
- [ ] My pull request uses an appropriate title, matching the conventional commit standards.
- [ ] My scope of feat/fix/chore/etc. correctly matches the nature of changes in my pull request.

### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
- [ ] Code coverage remains at or above the configured threshold.

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Reviewed-on: #1
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/config/handlers.ts

@@ -0,0 +1,23 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { about } from "../commands/about.js";
+import { add } from "../commands/add.js";
+import { list } from "../commands/list.js";
+import type { Command } from "../interfaces/command.js";
+
+const defaultHandler: Command = async(_lynira, interaction) => {
+  await interaction.editReply({
+    content: "This command is not implemented yet.",
+  });
+};
+
+export const handlers: { _default: Command } & Record<string, Command> = {
+  _default: defaultHandler,
+  about:    about,
+  add:      add,
+  list:     list,
+};

src/config/reservedSlugs.ts

@@ -0,0 +1,12 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+export const reservedSlugs = [
+  "error",
+  "unsub",
+  "overlimit",
+  "404",
+];