Add BT1035 pairing and station presets (fw 0.7.0).

Expose discoverable mode and A2DP control over REST, add persisted
DAB/FM preset list with web UI, and document gaps in docs/TODO.md.

Co-authored-by: Cursor <cursoragent@cursor.com>

Software/components/secure_store/include/secure_store/NvsSecureStore.hpp

@@ -100,6 +100,17 @@ public:
      */
     [[nodiscard]] std::expected<void, core::StoreError>
     clearWifiCredentials() override;
+
+    [[nodiscard]] bool hasStationList() const override;
+
+    [[nodiscard]] std::expected<void, core::StoreError>
+    saveStationListJson(std::string_view json) override;
+
+    [[nodiscard]] std::expected<std::string, core::StoreError>
+    loadStationListJson() const override;
+
+    [[nodiscard]] std::expected<void, core::StoreError>
+    clearStationList() override;
 };
 
 } // namespace secure_store