chore: remove tor from startos core

Tor is being moved from a built-in OS feature to a service. This removes
the Arti-based Tor client, onion address management, hidden service
creation, and all related code from the core backend, frontend, and SDK.

- Delete core/src/net/tor/ module (~2060 lines)
- Remove OnionAddress, TorSecretKey, TorController from all consumers
- Remove HostnameInfo::Onion and HostAddress::Onion variants
- Remove onion CRUD RPC endpoints and tor subcommand
- Remove tor key handling from account and backup/restore
- Remove ~12 tor-related Cargo dependencies (arti-client, torut, etc.)
- Remove tor UI components, API methods, mock data, and routes
- Remove OnionHostname and tor patterns/regexes from SDK
- Add v0_4_0_alpha_20 database migration to strip onion data
- Bump version to 0.4.0-alpha.20

web/projects/ui/src/app/services/api/embassy-api.service.ts

@@ -81,8 +81,6 @@ export abstract class ApiService {
     params: RR.GetServerLogsReq,
   ): Promise<RR.GetServerLogsRes>
 
-  abstract getTorLogs(params: RR.GetServerLogsReq): Promise<RR.GetServerLogsRes>
-
   abstract getKernelLogs(
     params: RR.GetServerLogsReq,
   ): Promise<RR.GetServerLogsRes>
@@ -91,10 +89,6 @@ export abstract class ApiService {
     params: RR.FollowServerLogsReq,
   ): Promise<RR.FollowServerLogsRes>
 
-  abstract followTorLogs(
-    params: RR.FollowServerLogsReq,
-  ): Promise<RR.FollowServerLogsRes>
-
   abstract followKernelLogs(
     params: RR.FollowServerLogsReq,
   ): Promise<RR.FollowServerLogsRes>
@@ -125,8 +119,6 @@ export abstract class ApiService {
 
   abstract queryDns(params: RR.QueryDnsReq): Promise<RR.QueryDnsRes>
 
-  abstract resetTor(params: RR.ResetTorReq): Promise<RR.ResetTorRes>
-
   // smtp
 
   abstract setSmtp(params: RR.SetSMTPReq): Promise<RR.SetSMTPRes>
@@ -344,22 +336,10 @@ export abstract class ApiService {
 
   abstract removeAcme(params: RR.RemoveAcmeReq): Promise<RR.RemoveAcmeRes>
 
-  abstract addTorKey(params: RR.AddTorKeyReq): Promise<RR.AddTorKeyRes>
-
-  abstract generateTorKey(
-    params: RR.GenerateTorKeyReq,
-  ): Promise<RR.AddTorKeyRes>
-
   abstract serverBindingToggleGateway(
     params: RR.ServerBindingToggleGatewayReq,
   ): Promise<RR.ServerBindingToggleGatewayRes>
 
-  abstract serverAddOnion(params: RR.ServerAddOnionReq): Promise<RR.AddOnionRes>
-
-  abstract serverRemoveOnion(
-    params: RR.ServerRemoveOnionReq,
-  ): Promise<RR.RemoveOnionRes>
-
   abstract osUiAddPublicDomain(
     params: RR.OsUiAddPublicDomainReq,
   ): Promise<RR.OsUiAddPublicDomainRes>
@@ -380,12 +360,6 @@ export abstract class ApiService {
     params: RR.PkgBindingToggleGatewayReq,
   ): Promise<RR.PkgBindingToggleGatewayRes>
 
-  abstract pkgAddOnion(params: RR.PkgAddOnionReq): Promise<RR.AddOnionRes>
-
-  abstract pkgRemoveOnion(
-    params: RR.PkgRemoveOnionReq,
-  ): Promise<RR.RemoveOnionRes>
-
   abstract pkgAddPublicDomain(
     params: RR.PkgAddPublicDomainReq,
   ): Promise<RR.PkgAddPublicDomainRes>