Introducing Orca Cloud: https://cloud.orcaslicer.com (#13414)

* Add OrcaCloud sync platform and preset bundle sharing system

  Introduce OrcaCloud, a cloud sync platform for user presets, alongside
  a preset bundle system that enables sharing printer/filament/process
  profiles as local exportable bundles or subscribed cloud bundles.

  OrcaCloud platform:
  - Auth to Orca Cloud
  - Encrypted token storage (file-based or system keychain)
  - User preset sync with
  - Profile migration from default/bambu folders on first login
  - Homepage integration with entrance to cloud.orcaslicer.com

  Preset bundles:
  - Local bundle import/export with bundle_structure.json metadata
  - Subscribed cloud bundles with version-based update checking
  - Thread-safe concurrent bundle access with read-write mutex
  - Canonical bundle preset naming (_local/<id>/... and _subscribed/<id>/...)
  - Bundle presets are read-only; grouped under subheaders in combo boxes
  - PresetBundleDialog with auto-sync toggle, refresh, update notifications
  - Hyperlinked bundle names to cloud bundle pages

  Co-authored-by: Sabriel Koh <sabrielkcr@gmail.com>
  Co-authored-by: Derrick <derrick992110@gmail.com>
  Co-authored-by: Mykola Nahirnyi <mnahirnyi@amcbridge.com>
  Co-authored-by: Ian Chua <iancrb00@gmail.com>
  Co-authored-by: Draginraptor <draginraptor@gmail.com>
  Co-authored-by: ExPikaPaka <112851715+ExPikaPaka@users.noreply.github.com>
  Co-authored-by: Ian Bassi <ian.bassi@outlook.com>
  Co-authored-by: Ocraftyone <Ocraftyone@users.noreply.github.com>
  Co-authored-by: yw4z <ywsyildiz@gmail.com>
  Co-authored-by: peterm-m <101202951+peterm-m@users.noreply.github.com>

* Fixed an issue on Windows it failed to login Orca Cloud with Google account

src/libslic3r/AppConfig.cpp

@@ -10,6 +10,7 @@
 #include "format.hpp"
 #include "nlohmann/json.hpp"
 
+#include <algorithm>
 #include <utility>
 #include <vector>
 #include <stdexcept>
@@ -320,6 +321,11 @@ void AppConfig::set_defaults()
     if (get("allow_abnormal_storage").empty()) {
         set_bool("allow_abnormal_storage", false);
     }
+
+    if (get("preset_bundle_auto_update").empty()) {
+        set_bool("preset_bundle_auto_update", false);
+    }
+
 #ifdef __linux__
     if (get(SETTING_USE_ENCRYPTED_TOKEN_FILE).empty())
         set_bool(SETTING_USE_ENCRYPTED_TOKEN_FILE, true);
@@ -357,6 +363,10 @@ void AppConfig::set_defaults()
         set_bool("show_daily_tips", true);
     }
 
+    if (get("show_shared_profiles_notification").empty()) {
+        set_bool("show_shared_profiles_notification", true);
+    }
+
     if (get("auto_calculate_flush").empty()){
         set("auto_calculate_flush","all");
     }
@@ -802,6 +812,18 @@ std::string AppConfig::load()
             if (it_section->second.empty())
                 m_storage.erase(it_section);
         }
+
+        // Default for new installs
+        if (get(SETTING_CLOUD_PROVIDERS).empty()) {
+            // Migrate add bbl cloud if installed_networking is true
+            bool enable_bbl_cloud = get_bool("installed_networking");
+            if (enable_bbl_cloud) {
+                // Legacy Bambu-only user: give them both providers
+                set(SETTING_CLOUD_PROVIDERS, "orca;bbl");
+            } else {
+                set(SETTING_CLOUD_PROVIDERS, "orca");
+            }
+        }
     }
 
     // Override missing or keys with their defaults.
@@ -1572,6 +1594,62 @@ void AppConfig::clear_remind_network_update_later()
     set_bool(SETTING_NETWORK_PLUGIN_REMIND_LATER, false);
 }
 
+std::vector<std::string> AppConfig::get_cloud_providers() const
+{
+    std::vector<std::string> result;
+    std::string providers = get(SETTING_CLOUD_PROVIDERS);
+    if (providers.empty()) {
+        result.push_back("orca");
+        return result;
+    }
+
+    std::stringstream ss(providers);
+    std::string provider;
+    while (std::getline(ss, provider, ';')) {
+        if (!provider.empty())
+            result.push_back(provider);
+    }
+    // Ensure "orca" is always present
+    if (std::find(result.begin(), result.end(), "orca") == result.end()) {
+        result.insert(result.begin(), "orca");
+    }
+    return result;
+}
+
+void AppConfig::set_cloud_providers(const std::vector<std::string>& providers)
+{
+    std::string joined;
+    for (size_t i = 0; i < providers.size(); ++i) {
+        if (i > 0) joined += ";";
+        joined += providers[i];
+    }
+    set(SETTING_CLOUD_PROVIDERS, joined);
+}
+
+bool AppConfig::has_cloud_provider(const std::string& provider) const
+{
+    auto providers = get_cloud_providers();
+    return std::find(providers.begin(), providers.end(), provider) != providers.end();
+}
+
+void AppConfig::add_cloud_provider(const std::string& provider)
+{
+    auto providers = get_cloud_providers();
+    if (std::find(providers.begin(), providers.end(), provider) == providers.end()) {
+        providers.push_back(provider);
+        set_cloud_providers(providers);
+    }
+}
+
+void AppConfig::remove_cloud_provider(const std::string& provider)
+{
+    if (provider == "orca")
+        return; // Cannot remove orca
+    auto providers = get_cloud_providers();
+    providers.erase(std::remove(providers.begin(), providers.end(), provider), providers.end());
+    set_cloud_providers(providers);
+}
+
 void AppConfig::reset_selections()
 {
     auto it = m_storage.find("presets");