feat: TS SDK v3 port, graph store removal, client v3 API migration

TypeScript SDK v3 pipeline (full parity with Python):
- Single-pass additive extraction with ADDITIVE_EXTRACTION_PROMPT
- Hybrid search (semantic + BM25 + entity boost) with additive scoring
- 8-phase batch pipeline (batch embed, persist, entity linking)
- New utils: scoring.ts, lemmatization.ts (natural), entity_extraction.ts (compromise)
- keywordSearch() on 8 vector stores (3 full: PGVector, Memory, Azure AI Search)
- Message persistence in SQLiteManager (rolling window of 10)
- Entity store as second vector collection
- MAX_BATCH=100 chunking guard on OpenAI/Azure embedBatch
- Updated default LLM model to gpt-4.1-nano-2025-04-14
- compromise + natural added as peer dependencies

Graph store removal (Python + TypeScript):
- Removed Neo4j, Memgraph, Kuzu, Neptune, Apache AGE integrations
- Deleted 18 graph-related files across both SDKs
- Removed GraphStoreFactory, GraphStoreConfig, graph_store config field
- Removed "relations" key from all API responses
- Removed graph optional dependency group from pyproject.toml
- Removed neo4j-driver from TS peerDependencies
- Simplified add/search/delete/reset (no more parallel graph operations)

Client SDK v3 API migration:
- add() endpoint: /v1/memories/ -> /v3/memories/ (async response)
- search() endpoint: /v2/memories/search/ -> /v3/memories/search/
- Removed output_format injection and v1.1 unwrapping logic
- Applied to both Python (sync + async) and TypeScript clients

Review feedback fixes:
- Removed deprecated custom_update_memory_prompt from MemoryConfig
- Added MAX_BATCH=100 chunking to Python + TS embed_batch
- Moved all inline imports to top level in main.py
- Cleaned up GraphStoreError dead code from exceptions.py

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mem0-ts/src/client/mem0.ts

@@ -190,7 +190,7 @@ export default class MemoryClient {
     this._captureEvent("add", [payloadKeys]);
 
     const response = await this._fetchWithErrorHandling(
-      `${this.host}/v1/memories/`,
+      `${this.host}/v3/memories/`,
       {
         method: "POST",
         headers: this.headers,
@@ -286,20 +286,18 @@ export default class MemoryClient {
     this._captureEvent("search", [payloadKeys]);
     const payload: Record<string, any> = {
       query,
-      output_format: "v1.1",
       ...camelToSnakeKeys(options ?? {}),
     };
 
     const response = await this._fetchWithErrorHandling(
-      `${this.host}/v2/memories/search/`,
+      `${this.host}/v3/memories/search/`,
       {
         method: "POST",
         headers: this.headers,
         body: JSON.stringify(payload),
       },
     );
-    // Unwrap v1.1 format: { results: [...] } → [...]
-    return Array.isArray(response) ? response : (response?.results ?? response);
+    return response;
   }
 
   async delete(memoryId: string): Promise<{ message: string }> {