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

[iris-clawd]

Problem

crewai install fails on Windows because lancedb (a hard dependency) does not publish Windows wheels — only Linux and macOS are supported.

Reported in #5045.

Solution

1. Platform-conditional dependency (pyproject.toml)

• lancedb>=0.29.2 is now installed only on non-Windows platforms (sys_platform != "win32")
• qdrant-edge-py>=0.6.0 is automatically installed on Windows (sys_platform == "win32")

2. Auto-detect default storage backend (unified_memory.py)

• The Memory.storage field now defaults to "qdrant-edge" on Windows and "lancedb" everywhere else
• This uses sys.platform at class definition time, so no runtime overhead

Changes

• lib/crewai/pyproject.toml — make lancedb conditional, add qdrant-edge-py for Windows
• lib/crewai/src/crewai/memory/unified_memory.py — import sys, change default storage to platform-aware

Notes

• CrewAI already has full qdrant-edge storage support (qdrant_edge_storage.py), so this just wires it as the default on Windows
• Users on Windows can still explicitly set storage="lancedb" if they install it manually
• No behavior change on Linux or macOS

Closes #5045

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Note

Medium Risk
Changes packaging and default memory backend selection on Windows, which can impact installation and persistence/recall behavior for Windows users. Non-Windows behavior should remain unchanged aside from dependency markers.

Overview
Fixes Windows installs by making the vector-store dependency platform-specific: lancedb is now excluded on win32 and qdrant-edge-py is installed instead.

Updates Memory in unified_memory.py to default storage to qdrant-edge on Windows (and lancedb elsewhere), aligning runtime defaults with the new dependency behavior.

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