feat: implement Bluesky scan posts job and enhance user scanning

- Add new ScanPostsJob for scanning Bluesky posts
- Enhance ScanUserJob with improved error handling and logging
- Update BlueskyPost model with new fields and validation
- Add auxiliary tables for Bluesky posts
- Improve job base classes with better color logging
- Update specs with proper HTTP mocking patterns
- Add factory for BlueskyPost testing

db/migrate/20250805070115_add_aux_tables_for_domain_posts_bluesky_posts.rb

@@ -14,7 +14,6 @@ class AddAuxTablesForDomainPostsBlueskyPosts < ActiveRecord::Migration[7.2]
       t.text :text # Post content
 
       # Post metadata (posted_at is in main table)
-      t.datetime :bluesky_created_at, index: true
       t.datetime :scanned_at
       t.string :language
 

db/structure.sql

@@ -1413,7 +1413,6 @@ CREATE TABLE public.domain_posts_bluesky_aux (
     bluesky_rkey character varying NOT NULL,
     at_uri character varying,
     text text,
-    bluesky_created_at timestamp(6) without time zone,
     scanned_at timestamp(6) without time zone,
     language character varying,
     like_count integer,
@@ -4381,13 +4380,6 @@ CREATE INDEX index_domain_post_groups_on_type ON public.domain_post_groups USING
 CREATE INDEX index_domain_posts_bluesky_aux_on_base_table_id ON public.domain_posts_bluesky_aux USING btree (base_table_id);
 
 
---
--- Name: index_domain_posts_bluesky_aux_on_bluesky_created_at; Type: INDEX; Schema: public; Owner: -
---
-
-CREATE INDEX index_domain_posts_bluesky_aux_on_bluesky_created_at ON public.domain_posts_bluesky_aux USING btree (bluesky_created_at);
-
-
 --
 -- Name: index_domain_posts_bluesky_aux_on_bluesky_rkey; Type: INDEX; Schema: public; Owner: -
 --