feat(matrix): support encrypted messages with E2EE

- Add `crypto_database_path` and `crypto_passphrase` configuration
- Integrate cryptohelper for decrypting `m.room.encrypted` events
- Handle both plaintext and encrypted messages in `handleMessageEvent`
- Enable `goolm` build tag for libsignal crypto support

Fixes #1840.

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/gorilla/websocket v1.5.3
 	github.com/h2non/filetype v1.1.3
 	github.com/larksuite/oapi-sdk-go/v3 v3.5.3
+	github.com/mattn/go-sqlite3 v1.14.34
 	github.com/mdp/qrterminal/v3 v3.2.1
 	github.com/modelcontextprotocol/go-sdk v1.4.1
 	github.com/mymmrac/telego v1.7.0
@@ -31,6 +32,7 @@ require (
 	github.com/spf13/cobra v1.10.2
 	github.com/stretchr/testify v1.11.1
 	github.com/tencent-connect/botgo v0.2.1
+	go.mau.fi/util v0.9.7
 	go.mau.fi/whatsmeow v0.0.0-20260219150138-7ae702b1eed4
 	golang.org/x/oauth2 v0.36.0
 	golang.org/x/term v0.41.0
@@ -77,7 +79,6 @@ require (
 	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/vektah/gqlparser/v2 v2.5.27 // indirect
 	go.mau.fi/libsignal v0.2.1 // indirect
-	go.mau.fi/util v0.9.7 // indirect
 	golang.org/x/exp v0.0.0-20260312153236-7ab1446f8b90 // indirect
 	golang.org/x/text v0.35.0 // indirect
 	modernc.org/libc v1.67.6 // indirect