fix(rust): match main's drizzle-style camelCase response shape

Frontend reads main's drizzle-generated camelCase fields (siteId,
accessToken, oauthProvider, etc.) and a nested `site: {...}` on each
account row. Rust models were serializing snake_case with no nested
site, so PUT /api/sites/undefined/disabled-models 404s, account.site?.id
is undefined everywhere, and similar shape mismatches break Accounts,
Sites, Tokens, and Dashboard pages.

- Add #[serde(rename_all = "camelCase")] to every model struct in
  src/db/models/* (Account, AccountToken, Site, User, Event,
  TokenRoute, RouteChannel, BackgroundTask, DownstreamApiKey,
  Organization/Member/Invitation, SiteAnnouncement)
- list_accounts now nests `site: {...}` per row, matching main's
  `{...account, site: {...}}` shape from accountsOverviewService
- admin user-detail endpoint emits camelCase keys (totalRequests,
  totalCost, last7DaysCost, recentLogs, promptTokens, completionTokens,
  totalTokens, createdAt) to match the frontend
- routes refresh endpoint now emits both affected_routes and
  affectedRoutes for forward compat

Co-Authored-By: Kiro <noreply@kiro.dev>

src/db/models/account.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Represents an account bound to a site.
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct Account {
     pub id: i64,
     pub site_id: i64,
@@ -30,6 +31,7 @@ pub struct Account {
 
 /// Represents an account token (from account_tokens table).
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct AccountToken {
     pub id: i64,
     pub account_id: i64,

src/db/models/background_task.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Background task for tracking async operations (deployments, syncs, etc.)
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct BackgroundTask {
     pub id: String,
     pub task_type: String,

src/db/models/downstream_api_key.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Represents a downstream API key for external consumers.
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct DownstreamApiKey {
     pub id: i64,
     pub name: String,

src/db/models/event.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// System event for admin notifications.
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct Event {
     pub id: i64,
     #[sqlx(rename = "type")]

src/db/models/organization.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Organization for multi-tenant setup.
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct Organization {
     pub id: i64,
     pub name: String,
@@ -15,6 +16,7 @@ pub struct Organization {
 
 /// Member of an organization.
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct OrganizationMember {
     pub id: i64,
     pub org_id: i64,
@@ -26,6 +28,7 @@ pub struct OrganizationMember {
 
 /// Invitation to join an organization.
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct Invitation {
     pub id: i64,
     pub org_id: i64,

src/db/models/route_channel.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Represents a route channel linking routes, accounts, and tokens.
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct RouteChannel {
     pub id: i64,
     pub route_id: i64,

src/db/models/site.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Represents a site (AI provider endpoint).
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct Site {
     pub id: i64,
     pub name: String,

src/db/models/site_announcement.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Site-level announcements (notifications from upstream providers).
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct SiteAnnouncement {
     pub id: i64,
     pub site_id: i64,

src/db/models/token_route.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// Represents a token route (model routing rule).
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct TokenRoute {
     pub id: i64,
     pub model_pattern: String,

src/db/models/user.rs

@@ -3,6 +3,7 @@ use sqlx::FromRow;
 
 /// A platform user (admin or regular).
 #[derive(Debug, Clone, Serialize, Deserialize, FromRow)]
+#[serde(rename_all = "camelCase")]
 pub struct User {
     pub id: i64,
     pub username: String,