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/002_message_rich_content.sql

@@ -0,0 +1,115 @@
+-- ============================================================
+-- Migration: 001_message_rich_content.sql
+-- Tables:  message_attachment, message_embed, message_embed_field,
+--          message_poll, message_poll_option, message_poll_vote
+-- ============================================================
+-- These tables extend the existing `message` table (from appks 001_init.sql)
+-- with Discord-style rich content: file attachments, link preview embeds,
+-- and interactive polls.
+
+BEGIN;
+
+-- models/message_attachment.rs  →  message_attachment
+CREATE TABLE IF NOT EXISTS message_attachment (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    message_id    UUID NOT NULL REFERENCES message(id) ON DELETE CASCADE,
+    filename      TEXT NOT NULL,
+    content_type  TEXT NULL,
+    size          BIGINT NOT NULL,
+    url           TEXT NOT NULL,
+    storage_key   TEXT NULL,
+    width         INTEGER NULL,
+    height        INTEGER NULL,
+    duration_secs DOUBLE PRECISION NULL,
+    blurhash      TEXT NULL,
+    spoiler       BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS idx_message_attachment_message_id
+    ON message_attachment (message_id);
+
+-- models/message_embed.rs  →  message_embed
+CREATE TABLE IF NOT EXISTS message_embed (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    message_id       UUID NOT NULL REFERENCES message(id) ON DELETE CASCADE,
+    embed_type       TEXT NOT NULL,
+    title            TEXT NULL,
+    description      TEXT NULL,
+    url              TEXT NULL,
+    color            INTEGER NULL,
+    image_url        TEXT NULL,
+    image_width      INTEGER NULL,
+    image_height     INTEGER NULL,
+    thumbnail_url    TEXT NULL,
+    thumbnail_width  INTEGER NULL,
+    thumbnail_height INTEGER NULL,
+    video_url        TEXT NULL,
+    video_width      INTEGER NULL,
+    video_height     INTEGER NULL,
+    author_name      TEXT NULL,
+    author_url       TEXT NULL,
+    author_icon_url  TEXT NULL,
+    footer_text      TEXT NULL,
+    footer_icon_url  TEXT NULL,
+    provider_name    TEXT NULL,
+    provider_url     TEXT NULL,
+    created_at       TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS idx_message_embed_message_id
+    ON message_embed (message_id);
+
+-- models/message_embed.rs  →  message_embed_field
+CREATE TABLE IF NOT EXISTS message_embed_field (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    embed_id UUID NOT NULL REFERENCES message_embed(id) ON DELETE CASCADE,
+    name     TEXT NOT NULL,
+    value    TEXT NOT NULL,
+    inline   BOOLEAN NOT NULL DEFAULT FALSE,
+    position INTEGER NOT NULL DEFAULT 0
+);
+CREATE INDEX IF NOT EXISTS idx_message_embed_field_embed_id
+    ON message_embed_field (embed_id);
+
+-- models/message_poll.rs  →  message_poll
+CREATE TABLE IF NOT EXISTS message_poll (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    message_id        UUID NOT NULL REFERENCES message(id) ON DELETE CASCADE,
+    question          TEXT NOT NULL,
+    allow_multiselect BOOLEAN NOT NULL DEFAULT FALSE,
+    max_selections    INTEGER NULL,
+    expires_at        TIMESTAMPTZ NULL,
+    total_votes       BIGINT NOT NULL DEFAULT 0,
+    created_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CONSTRAINT uq_message_poll_message UNIQUE (message_id)
+);
+CREATE INDEX IF NOT EXISTS idx_message_poll_message_id
+    ON message_poll (message_id);
+
+-- models/message_poll.rs  →  message_poll_option
+CREATE TABLE IF NOT EXISTS message_poll_option (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    poll_id    UUID NOT NULL REFERENCES message_poll(id) ON DELETE CASCADE,
+    text       TEXT NOT NULL,
+    emoji      TEXT NULL,
+    vote_count BIGINT NOT NULL DEFAULT 0,
+    position   INTEGER NOT NULL DEFAULT 0
+);
+CREATE INDEX IF NOT EXISTS idx_message_poll_option_poll_id
+    ON message_poll_option (poll_id);
+
+-- models/message_poll.rs  →  message_poll_vote
+CREATE TABLE IF NOT EXISTS message_poll_vote (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    poll_id    UUID NOT NULL REFERENCES message_poll(id) ON DELETE CASCADE,
+    option_id  UUID NOT NULL REFERENCES message_poll_option(id) ON DELETE CASCADE,
+    user_id    UUID NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CONSTRAINT uq_message_poll_vote UNIQUE (poll_id, user_id, option_id)
+);
+CREATE INDEX IF NOT EXISTS idx_message_poll_vote_poll_id
+    ON message_poll_vote (poll_id);
+CREATE INDEX IF NOT EXISTS idx_message_poll_vote_user_id
+    ON message_poll_vote (user_id);
+
+COMMIT;