Integrate NDK for Nostr client functionality and update dependencies

This commit introduces the Nostr Development Kit (NDK) to enhance the Nostr client functionality. Key changes include:

- Added `NDKPrivateKeySigner` for improved authentication methods in `LoginModal.svelte` and `App.svelte`.
- Refactored the Nostr client to utilize NDK for connection and event fetching, streamlining the connection process and event handling.
- Updated `go.mod` and `package.json` to include `@nostr-dev-kit/ndk` as a dependency.
- Created a new `package-lock.json` to reflect the updated dependency tree.

These changes improve the overall architecture and maintainability of the Nostr client.

go.sum

@@ -45,8 +45,6 @@ github.com/google/pprof v0.0.0-20211214055906-6f57359322fd/go.mod h1:KgnwoLYCZ8I
 github.com/google/pprof v0.0.0-20240227163752-401108e1b7e7/go.mod h1:czg5+yv1E0ZGTi6S6vVK1mke0fV+FaUhNGcd6VRS9Ik=
 github.com/google/pprof v0.0.0-20251002213607-436353cc1ee6 h1:/WHh/1k4thM/w+PAZEIiZK9NwCMFahw5tUzKUCnUtds=
 github.com/google/pprof v0.0.0-20251002213607-436353cc1ee6/go.mod h1:I6V7YzU0XDpsHqbsyrghnFZLO1gwK6NPTNvmetQIk9U=
-github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
-github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/ianlancetaylor/demangle v0.0.0-20210905161508-09a460cdf81d/go.mod h1:aYm2/VgdVmcIU8iMfdMvDMsRAQjcfZSKFby6HOFvi/w=
 github.com/ianlancetaylor/demangle v0.0.0-20230524184225-eabc099b10ab/go.mod h1:gx7rwoVhcfuVKG5uya9Hs3Sxj7EIvldVofAWIUtGouw=
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
@@ -62,6 +60,8 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/ledongthuc/pdf v0.0.0-20220302134840-0c2507a12d80/go.mod h1:imJHygn/1yfhB7XSJJKlFZKl/J+dCPAknuiaGOshXAs=
 github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
+github.com/nostr-dev-kit/ndk v0.0.0-20251010140307-0653d6e69923 h1:N+sorUpSXhIxJeJ4A81SC3UTwo4S+BL3ECB/QSYS5qE=
+github.com/nostr-dev-kit/ndk v0.0.0-20251010140307-0653d6e69923/go.mod h1:g76mM+6X3X2E9gM9VP+1I9arcSIhCLwknT1HAXJA+Z8=
 github.com/orisano/pixelmatch v0.0.0-20220722002657-fb0b55479cde/go.mod h1:nZgzbfBr3hhjoZnS66nKrHmduYNpc34ny7RK4z5/HM0=
 github.com/pkg/profile v1.7.0 h1:hnbDkaNWPCLMO9wGLdBFTIZvzDrDfBM2072E1S9gJkA=
 github.com/pkg/profile v1.7.0/go.mod h1:8Uer0jas47ZQMJ7VD+OHknK4YDY07LPUC6dEvqDjvNo=