fix(auth): the session row must carry the id the token claims

The sid revocation check added in e2589d4 rejected EVERY authenticated request
with 401. issue_session generated session_id = Uuid::new_v4(), minted the access
token with it as sid, then called create_session WITHOUT passing it, so Postgres
assigned the row a different primary key. is_session_live(sid) therefore never
matched and the liveness check failed closed on every call.

Both halves were individually correct, which is why unit tests did not catch it:
303 backend tests passed throughout. The e2e suite caught it, as a wallet that
authenticated successfully and then showed 0 for every asset.

NewSession now carries the id explicitly and create_session binds it, at all
three call sites (extension/website login and the refresh rotation, which shares
the helper).

Verified: fiat-balance e2e goes from all-zero to $108.21.

src/api/auth.rs

@@ -224,6 +224,7 @@ async fn issue_session(
     state
         .db
         .create_session(NewSession {
+            id: session_id,
             user_id,
             refresh_token_hash,
             platform: platform.to_string(),

src/api/website.rs

@@ -302,6 +302,7 @@ pub async fn website_verify(
     state
         .db
         .create_session(NewSession {
+            id: session_id,
             user_id: user.id,
             refresh_token_hash,
             platform: Platform::Web.to_string(),

src/infra/db/sessions.rs

@@ -22,11 +22,15 @@ impl Database {
     #[instrument(skip(self, input), fields(user_id = %input.user_id, platform = %input.platform))]
     pub async fn create_session(&self, input: NewSession) -> Result<Session, AppError> {
         let sql = format!(
+            // `id` is bound explicitly: the access token carries it as `sid`,
+            // so the row and the token must agree or revocation checks reject
+            // every request.
             "INSERT INTO sessions \
-             (user_id, refresh_token_hash, platform, device_info, expires_at) \
-             VALUES ($1, $2, $3, $4, $5) RETURNING {SESSION_COLS}"
+             (id, user_id, refresh_token_hash, platform, device_info, expires_at) \
+             VALUES ($1, $2, $3, $4, $5, $6) RETURNING {SESSION_COLS}"
         );
         let session = sqlx::query_as::<_, Session>(&sql)
+            .bind(input.id)
             .bind(input.user_id)
             .bind(&input.refresh_token_hash)
             .bind(&input.platform)

src/models/db.rs

@@ -208,6 +208,11 @@ pub struct NewUser {
 
 #[derive(Debug, Clone)]
 pub struct NewSession {
+    /// The session's primary key. Supplied by the caller (NOT defaulted by the
+    /// DB) because the access token embeds it as `sid` for revocation: if the
+    /// row got a different id than the token, every authenticated request would
+    /// fail the liveness check.
+    pub id: Uuid,
     pub user_id: Uuid,
     pub refresh_token_hash: String,
     pub platform: String,