refactor: content-addressed assets, cross-channel multimodal, infra simplification (#63)

* refactor(attachment): multimodal attachment refactor with snapshot schema and storage layer

- Add snapshot schema migration (0008) and update init/versions/snapshots
- Add internal/attachment and internal/channel normalize for unified attachment handling
- Move containerfs provider from internal/media to internal/storage
- Update agent types, channel adapters (Telegram/Feishu), inbound and handlers
- Add containerd snapshot lineage and local_channel tests
- Regenerate sqlc, swagger and SDK

* refactor(media): content-addressed asset system with unified naming

- Replace asset_id foreign key with content_hash as sole identifier
  for bot_history_message_assets (pure soft-link model)
- Remove mime, size_bytes, storage_key from DB; derive at read time
  via media.Resolve from actual storage
- Merge migrations 0008/0009 into single 0008; keep 0001 as canonical schema
- Add Docker initdb script for deterministic migration execution order
- Fix cross-channel real-time image display (Telegram → WebUI SSE)
- Fix message disappearing on refresh (null assets fallback)
- Fix file icon instead of image preview (mime derivation from storage)
- Unify AssetID → ContentHash naming across Go, Agent, and Frontend
- Change storage key prefix from 4-char to 2-char for directory sharding
- Add server-entrypoint.sh for Docker deployment migration handling

* refactor(infra): embedded migrations, Docker simplification, and config consolidation

- Embed SQL migrations into Go binary, removing shell-based migration scripts
- Consolidate config files into conf/ directory (app.example.toml, app.docker.toml, app.dev.toml)
- Simplify Docker setup: remove initdb.d scripts, streamline nginx config and entrypoint
- Remove legacy CLI, feishu-echo commands, and obsolete incremental migration files
- Update install script and docs to require sudo for one-click install
- Add mise tasks for dev environment orchestration

* chore: recover migrations

---------

Co-authored-by: Acbox <acbox0328@gmail.com>

conf/app.docker.toml

@@ -0,0 +1,56 @@
+## Service configuration
+[log]
+level = "info"
+format = "text"
+
+[server]
+addr = "server:8080"
+
+## Admin
+[admin]
+username = "admin"
+password = "admin123"
+email = "admin@memoh.local"
+
+## Auth configuration
+[auth]
+jwt_secret = "YZq8kXrW5dFpNt9mLxQvHbRjKsMnOePw"
+jwt_expires_in = "168h"
+
+## Docker configuration
+[containerd]
+socket_path = "/run/containerd/containerd.sock"
+namespace = "default"
+
+[mcp]
+image = "docker.io/library/memoh-mcp:latest"
+snapshotter = "overlayfs"
+data_root = "/opt/memoh/data"
+data_mount = "/data"
+
+## Postgres configuration
+[postgres]
+host = "postgres"
+port = 5432
+user = "memoh"
+password = "memoh123"
+database = "memoh"
+sslmode = "disable"
+
+## Qdrant configuration
+[qdrant]
+base_url = "http://qdrant:6334"
+api_key = ""
+collection = "memory"
+timeout_seconds = 10
+
+## Agent Gateway
+[agent_gateway]
+host = "agent"
+port = 8081
+server_addr = "server:8080"
+
+## Web
+[web]
+host = "127.0.0.1"
+port = 8082