feat(signal): add postgres-backed signal protocol store

Cargo.toml

@@ -21,10 +21,11 @@ members = [
     "crates/tranquil-oauth-server",
     "crates/tranquil-api",
     "crates/tranquil-lexicon",
+    "crates/tranquil-signal",
 ]
 
 [workspace.package]
-version = "0.4.6"
+version = "0.4.7"
 edition = "2024"
 license = "AGPL-3.0-or-later"
 
@@ -49,6 +50,9 @@ tranquil-server = { path = "crates/tranquil-server" }
 tranquil-sync = { path = "crates/tranquil-sync" }
 tranquil-oauth-server = { path = "crates/tranquil-oauth-server" }
 tranquil-api = { path = "crates/tranquil-api" }
+tranquil-signal = { path = "crates/tranquil-signal" }
+
+presage = { git = "https://github.com/whisperfish/presage", rev = "fe3ed54c4844ae51c3a9fa49cf80a7816a31a425", default-features = false }
 
 unicode-segmentation = "1"
 
@@ -81,6 +85,7 @@ hkdf = "0.12"
 hmac = "0.12"
 http = "1.4"
 image = { version = "0.25", default-features = false, features = ["jpeg", "png", "gif", "webp"] }
+qrcodegen = "1.8"
 infer = "0.19"
 ipld-core = "0.4"
 iroh-car = "0.5"
@@ -129,6 +134,9 @@ testcontainers = "0.26"
 testcontainers-modules = { version = "0.14", features = ["postgres"] }
 wiremock = "0.6"
 
+[patch.crates-io]
+curve25519-dalek = { git = "https://github.com/signalapp/curve25519-dalek", tag = "signal-curve25519-4.1.3" }
+
 [profile.release]
 lto = "fat"
 strip = true