feat: add memfs-py service (#9315)

* feat: add memfs-py service

* add tf for bucket access and secrets v2 access

* feat(memfs): add helm charts, deploy workflow, and bug fixes

- Add dev helm chart (helm/dev/memfs-py/) with CSI secrets pattern
- Update prod helm chart with CSI secrets and correct service account
- Add GitHub Actions deploy workflow
- Change port from 8284 to 8285 to avoid conflict with core's dulwich sidecar
- Fix chunked transfer encoding issue (strip HTTP_TRANSFER_ENCODING header)
- Fix timestamp parsing to handle both ISO and HTTP date formats
- Fix get_head_sha to raise FileNotFoundError on 404

🐾 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta <noreply@letta.com>

---------

Co-authored-by: Kian Jones <kian@letta.com>
Co-authored-by: Letta <noreply@letta.com>

letta/server/server.py

@@ -433,7 +433,8 @@ class SyncServer(object):
     def _init_memory_repo_manager(self) -> Optional[MemoryRepoManager]:
         """Initialize the memory repository manager if configured.
 
-        Configure the object store via settings (recommended):
+        If LETTA_MEMFS_SERVICE_URL is set, uses the external memfs service.
+        Otherwise, configure the object store via settings (recommended):
 
             LETTA_OBJECT_STORE_URI="gs://my-bucket/repository?project=my-gcp-project"
 
@@ -441,7 +442,7 @@ class SyncServer(object):
         - gs:// (or gcs://) -> Google Cloud Storage
 
         Returns:
-            MemoryRepoManager if configured, None otherwise
+            MemoryRepoManager (or MemfsClient) if configured, None otherwise
         """
 
         # Keep import local to avoid import/circular issues during server bootstrap.
@@ -449,6 +450,13 @@ class SyncServer(object):
 
         from letta.settings import settings
 
+        # Check if memfs service is configured (takes priority over local object store)
+        if settings.memfs_service_url:
+            from letta.services.memory_repo import MemfsClient
+
+            logger.info("Memory repo manager using memfs service: %s", settings.memfs_service_url)
+            return MemfsClient(base_url=settings.memfs_service_url)
+
         uri = settings.object_store_uri
         if not uri:
             logger.debug("Memory repo manager not configured (object_store_uri not set)")