feat: mock exercise template api (#613)

* feat: move mock exercise template to api

* feat: add template migration file

* chore:
- remove exercise templates form api
- rework api to pull exercise templates from db
- add exercise template seed to seed file
- declutter seed file

* chore:
- refactor template fetch to be dependent on the selected tag
- add tag to schema, remote db and template's seed file
- clear remote db's template table and replace data and their respective tags

* chore: add number of questions and center loading screen on the frontend

* chore: pr fixes

* chore: type fixes

* chore:
- move seed functionality to /seed folder
- add typing for individual seed functions
- pr fixes

* chore: pr fixes v2

* update output css

* refactor: update seeding script and schema definitions

- Renamed `seedTypes` to `seedQuestionTypes` for clarity in the seeding process.
- Enhanced the seeding script to include a command-line interface for better usability, allowing specific seed functions to be executed based on flags.
- Removed redundant unique constraints in the schema definitions for `courseNewsfeedComment` and `exerciseTemplate` to streamline database structure.

* feat: add email verification error handling page and update session management

- Introduced a new page for handling email verification errors, providing user-friendly messages based on error types.
- Updated session management logic to improve handling of public routes and session states.
- Enhanced security policies in the Svelte configuration to include additional sources for styles and scripts.
- Removed the old email verification error page to streamline the codebase.

* move the exercise template to cloudflare cdn

---------

Co-authored-by: Rotimi Best <best@classroomio.com>

apps/api/src/services/exercise/template.ts

@@ -0,0 +1,54 @@
+import { calculateTotalPoints } from '@api/utils/template';
+import { getAllTemplates, getTemplateById, getTemplateByTag } from '@db/queries/template/template';
+import { TNewExerciseTemplate, TExerciseTemplate } from '@db/types';
+
+function mapTemplateToMetadata(templates: TNewExerciseTemplate[]) {
+  return templates.map((template) => {
+    const questionnaire = template.questionnaire;
+
+    return {
+      id: template.id,
+      title: template.title,
+      description: template.description,
+      questions: questionnaire.questions.length,
+      points: calculateTotalPoints(template),
+      tag: template.tag
+    };
+  });
+}
+
+export async function fetchAllTemplatesMetadata() {
+  let templates: TExerciseTemplate[];
+  try {
+    templates = await getAllTemplates();
+  } catch (error) {
+    console.error('Failed to fetch templates from DB:', error);
+    throw error;
+  }
+
+  return mapTemplateToMetadata(templates);
+}
+
+export async function fetchTemplateById(id: number): Promise<TExerciseTemplate> {
+  let template: TExerciseTemplate;
+  try {
+    template = await getTemplateById(id);
+  } catch (error) {
+    console.error('Failed to fetch template from DB:', error);
+    throw error;
+  }
+
+  return template;
+}
+
+export async function fetchTemplatesByTag(tag: string) {
+  let templates: TNewExerciseTemplate[];
+  try {
+    templates = await getTemplateByTag(tag);
+  } catch (error) {
+    console.error('Failed to fetch templates from DB:', error);
+    throw error;
+  }
+
+  return mapTemplateToMetadata(templates);
+}