feat(message): add comprehensive message system with database migrations and health checks

- Add database migrations for message base table with indexes for efficient querying
- Implement rich content support with attachment, embed, and poll tables
- Create social features including reactions, bookmarks, mentions, and read states
- Add thread management with participant tracking and resolution capabilities
- Include article posts with title, cover image, tags, and engagement metrics
- Support scheduled messages, stickers, forwards, and interactive components
- Fix UUID defaults and ensure proper uniqueness constraints for drafts
- Add gRPC health server for imks and health check client for appks connectivity
- Replace non-connectable 0.0.0.0 addresses with localhost in service discovery
- Normalize addresses during RPC configuration to handle bind address issues

migrate/007_fix_uuid_defaults_and_draft_null.sql

@@ -0,0 +1,33 @@
+-- Align imks-managed IDs with application-generated UUID v7 values and
+-- make top-level drafts unique when thread_id is NULL.
+
+BEGIN;
+
+CREATE UNIQUE INDEX IF NOT EXISTS uq_message_draft_channel_user_no_thread
+    ON message_draft (channel_id, user_id)
+    WHERE thread_id IS NULL;
+
+ALTER TABLE message ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_attachment ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_embed ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_embed_field ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_poll ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_poll_option ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_poll_vote ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_pin ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_read_state ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_draft ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_edit ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_article ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_reaction ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_bookmark ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_mention ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_thread ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_thread_participant ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_notification ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_scheduled ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_sticker ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_forward ALTER COLUMN id DROP DEFAULT;
+ALTER TABLE message_component ALTER COLUMN id DROP DEFAULT;
+
+COMMIT;