chore: remove opkg CLI integration and dead code (#1268)

- Delete src/opkg.rs (opkg_install + fallback chain) and commands/opkg.rs
- Relocate import_skill from commands/opkg.rs to commands/skills.rs (actively used)
- Remove opkg_install from Tauri handler registration in lib.rs
- Delete dead opkgInstall() from tauri.ts (zero callers)
- Remove apply_augmented_path/augmented_path_env from paths.rs (only consumer was opkg)
- Strip opkg mentions from i18n locale strings (en, zh, ja, vi, pt-BR)
- Remove OpenPackage Notes sections from README.md, README_ZH.md, README_ZH_hk.md
- Update ARCHITECTURE.md: rename OpenPackage Registry to Skill Registry
- Clean up PRD references in openwork-server-ownership-minimal-tauri.md

apps/desktop/src-tauri/src/lib.rs

@@ -5,7 +5,6 @@ mod engine;
 mod fs;
 mod opencode_router;
 mod openwork_server;
-mod opkg;
 mod orchestrator;
 mod paths;
 mod platform;
@@ -32,7 +31,6 @@ use commands::opencode_router::{
     opencodeRouter_stop,
 };
 use commands::openwork_server::{openwork_server_info, openwork_server_restart};
-use commands::opkg::{import_skill, opkg_install};
 use commands::orchestrator::{
     orchestrator_instance_dispose, orchestrator_start_detached, orchestrator_status,
     orchestrator_workspace_activate, sandbox_cleanup_openwork_containers, sandbox_debug_probe,
@@ -40,7 +38,8 @@ use commands::orchestrator::{
 };
 use commands::scheduler::{scheduler_delete_job, scheduler_list_jobs};
 use commands::skills::{
-    install_skill_template, list_local_skills, read_local_skill, uninstall_skill, write_local_skill,
+    import_skill, install_skill_template, list_local_skills, read_local_skill, uninstall_skill,
+    write_local_skill,
 };
 use commands::updater::updater_environment;
 use commands::window::set_window_decorations;
@@ -202,7 +201,6 @@ pub fn run() {
             opencode_command_delete,
             workspace_openwork_read,
             workspace_openwork_write,
-            opkg_install,
             import_skill,
             install_skill_template,
             list_local_skills,