feat(worker/mastodon): apply Postgres DB for mastodon handle storage and modify query functions

[FrankLi123]

Summary

This PR includes the following changes:

• Migrated Mastodon handle data storage from Redis to Postgres DB.
• Add simple batch-insert feature
• Implemented new query functions for federated API handlers.
• Enabled pagination using limit and cursor parameters for federated API requests.
• Fixed new file structure to ensure consistency

Checklist

• The commit message follows Angular Contributing guidelines;
• Tests for the changes have been added (for bug fixes / features);

Does this PR introduce a breaking change?

• Yes
• No

Other information

[FrankLi123]

Endpoint

GET /federated/handles

Retrieve a paginated list of updated Mastodon handles based on a timestamp (since) with optional pagination.

Request Parameters

1. since

   • Example: since=1728999503

2. cursor (optional)

   • Pagination cursor in the format handle.
   • Example: @[email protected]

3. limit (optional, default: 100)

   • Number of handles to return.
   • Example: limit=10

---

Request Example

Make request with since:

curl --location 'http://localhost/federated/handles?cursor=%40noellabo%40fedibird.com&limit=10' \
--header 'Authorization: Bearer test'

{
    "handles": [
        "@[email protected]",
        "@[email protected]",
        "@[email protected]",
        "@[email protected]",
        "@[email protected]",
        "@[email protected]",
        "@[email protected]",
        "@[email protected]",
        "@[email protected]",
        "@[email protected]"
    ],
    "cursor": "@[email protected]",
    "total_count": 10
}