Add Neo4j memory tuning config and query result limits (v0.43.0)

- Add Neo4j driver config options for memory management:
  - ORLY_NEO4J_MAX_CONN_POOL (default: 25) - connection pool size
  - ORLY_NEO4J_FETCH_SIZE (default: 1000) - records per batch
  - ORLY_NEO4J_MAX_TX_RETRY_SEC (default: 30) - transaction retry timeout
  - ORLY_NEO4J_QUERY_RESULT_LIMIT (default: 10000) - max results per query
- Apply driver settings when creating Neo4j connection (pool size, fetch size, retry time)
- Enforce query result limit as safety cap on all Cypher queries
- Fix QueryForSerials and QueryForIds to preserve LIMIT clauses
- Add comprehensive memory tuning documentation with sizing guidelines
- Add NIP-46 signer-based authentication for bunker connections
- Update go.mod with new dependencies

Files modified:
- app/config/config.go: Add Neo4j driver tuning config vars
- main.go: Pass new config values to database factory
- pkg/database/factory.go: Add Neo4j tuning fields to DatabaseConfig
- pkg/database/factory_wasm.go: Mirror factory.go changes for WASM
- pkg/neo4j/neo4j.go: Apply driver config, add getter methods
- pkg/neo4j/query-events.go: Enforce query result limit, fix LIMIT preservation
- docs/NEO4J_BACKEND.md: Add Memory Tuning section, update Docker example
- CLAUDE.md: Add Neo4j memory tuning quick reference
- app/handle-req.go: NIP-46 signer authentication
- app/publisher.go: HasActiveNIP46Signer check
- pkg/protocol/publish/publisher.go: NIP46SignerChecker interface
- go.mod: Add dependencies

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

main.go

@@ -525,21 +525,26 @@ func makeDatabaseConfig(cfg *config.C) *database.DatabaseConfig {
 		queryCacheDisabled,
 		serialCachePubkeys, serialCacheEventIds,
 		zstdLevel,
-		neo4jURI, neo4jUser, neo4jPassword := cfg.GetDatabaseConfigValues()
+		neo4jURI, neo4jUser, neo4jPassword,
+		neo4jMaxConnPoolSize, neo4jFetchSize, neo4jMaxTxRetrySeconds, neo4jQueryResultLimit := cfg.GetDatabaseConfigValues()
 
 	return &database.DatabaseConfig{
-		DataDir:             dataDir,
-		LogLevel:            logLevel,
-		BlockCacheMB:        blockCacheMB,
-		IndexCacheMB:        indexCacheMB,
-		QueryCacheSizeMB:    queryCacheSizeMB,
-		QueryCacheMaxAge:    queryCacheMaxAge,
-		QueryCacheDisabled:  queryCacheDisabled,
-		SerialCachePubkeys:  serialCachePubkeys,
-		SerialCacheEventIds: serialCacheEventIds,
-		ZSTDLevel:           zstdLevel,
-		Neo4jURI:            neo4jURI,
-		Neo4jUser:           neo4jUser,
-		Neo4jPassword:       neo4jPassword,
+		DataDir:                dataDir,
+		LogLevel:               logLevel,
+		BlockCacheMB:           blockCacheMB,
+		IndexCacheMB:           indexCacheMB,
+		QueryCacheSizeMB:       queryCacheSizeMB,
+		QueryCacheMaxAge:       queryCacheMaxAge,
+		QueryCacheDisabled:     queryCacheDisabled,
+		SerialCachePubkeys:     serialCachePubkeys,
+		SerialCacheEventIds:    serialCacheEventIds,
+		ZSTDLevel:              zstdLevel,
+		Neo4jURI:               neo4jURI,
+		Neo4jUser:              neo4jUser,
+		Neo4jPassword:          neo4jPassword,
+		Neo4jMaxConnPoolSize:   neo4jMaxConnPoolSize,
+		Neo4jFetchSize:         neo4jFetchSize,
+		Neo4jMaxTxRetrySeconds: neo4jMaxTxRetrySeconds,
+		Neo4jQueryResultLimit:  neo4jQueryResultLimit,
 	}
 }