feat: implement NIP-09 (deletions) and NIP-11 (relay info)

NIP-11 (Relay Information Document):
- Serves relay metadata at GET / with Accept: application/nostr+json
- Returns name, description, supported NIPs, limitations
- CORS headers for browser compatibility

NIP-09 (Event Deletion):
- Kind 5 events delete events referenced in 'e' tags
- Only authors can delete their own events
- Soft delete (marks deleted=1)
- Records deletion in deletions table
- Works across all protocols (gRPC, Connect, WebSocket)

Fixed deletions schema:
- deleted_event_id as PRIMARY KEY (not deletion_event_id)
- Allows one deletion event to delete multiple events

3 new tests, 44 total tests passing

Supported NIPs now: 1, 9, 11

1 files changed, 2 insertions, 2 deletions

diff --git a/internal/storage/storage.go b/internal/storage/storage.go
index 64fc4c6..806acac 100644
--- a/internal/storage/storage.go
+++ b/internal/storage/storage.go
@@ -101,8 +101,8 @@ func (s *Storage) initSchema(ctx context.Context) error {
 
         -- Deletion events (NIP-09)
         CREATE TABLE IF NOT EXISTS deletions (
-                event_id TEXT PRIMARY KEY,          -- ID of deletion event
-                deleted_event_id TEXT NOT NULL,     -- ID of event being deleted
+                deleted_event_id TEXT PRIMARY KEY,  -- ID of event being deleted
+                deletion_event_id TEXT NOT NULL,    -- ID of deletion event
                 pubkey TEXT NOT NULL,               -- Who requested deletion
                 created_at INTEGER NOT NULL,
                 FOREIGN KEY (deleted_event_id) REFERENCES events(id)