fix: auto-use qdrant-edge on Windows where lancedb has no wheels (#5045)

lancedb v0.30.x only ships wheels for Linux and macOS. On Windows,
`crewai install` fails because there is no compatible distribution.

This change:
- Makes lancedb a platform-conditional dependency (non-Windows only)
- Adds qdrant-edge-py as an automatic dependency on Windows
- Defaults Memory storage to qdrant-edge on Windows

Closes #5045

lib/crewai/pyproject.toml

@@ -43,7 +43,8 @@ dependencies = [
     "uv~=0.9.13",
     "aiosqlite~=0.21.0",
     "pyyaml~=6.0",
-    "lancedb>=0.29.2",
+    "lancedb>=0.29.2; sys_platform != 'win32'",
+    "qdrant-edge-py>=0.6.0; sys_platform == 'win32'",
 ]
 
 [project.urls]

lib/crewai/src/crewai/memory/unified_memory.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import sys
 from concurrent.futures import Future, ThreadPoolExecutor
 import contextvars
 from datetime import datetime
@@ -68,7 +69,7 @@ class Memory(BaseModel):
         description="LLM for analysis (model name or BaseLLM instance).",
     )
     storage: Annotated[StorageBackend | str, PlainValidator(_passthrough)] = Field(
-        default="lancedb",
+        default="qdrant-edge" if sys.platform == "win32" else "lancedb",
         description="Storage backend instance or path string.",
     )
     embedder: Any = Field(