fix: Adjust relationship between ServerGroup and Server/SharedServer

[lkmatsumura]

• Adjusting relationship

  • ServerGroup has many Servers
  • ServerGroup has many SharedServers
  • Server has one ServerGroup not servers
  • SharedServer has one ServerGroup not servers
  • Using back_populates instead of backref for better control

• Adjusted references to ServerGroup in server (was server.serves): server.servergroup.name instead server.servers.name

• Not find references to ServerGroup in SharedServer (sharedServer.servers)

Summary by CodeRabbit

• Refactor
  • Restructured database model relationships to improve server organization and grouping management.
  • Updated server grouping references in schema comparison and SQL editor tools for consistency across the application.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 04fa05c and e94c5ec.

📒 Files selected for processing (3)

• web/pgadmin/model/__init__.py
• web/pgadmin/tools/schema_diff/__init__.py
• web/pgadmin/tools/sqleditor/__init__.py

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[dpage]

This is a reasonable readability cleanup — the Server.servers relationship was confusingly named (it pointed to the one ServerGroup), so Server.servergroup / ServerGroup.servers + back_populates reads much better.

I checked the rest of the tree: the three call sites you updated (schema_diff ×3, sqleditor ×1) are the only real users of the old server.servers attribute, and nothing references the old auto-generated backref names (servergroup.server / .sharedserver), so dropping them is safe. The cascade is correctly carried over onto the new ServerGroup.servers/sharedservers relationships, and the FK columns are unchanged — so no schema/migration impact.

Two things before merge:

• No changelog entry — this still wants a one-line "Housekeeping" entry in the current docs/en_US/release_notes_*.rst.
• It's a pure rename with no functional change and no test; that's fine for a cleanup, but worth confirming the relationship rename doesn't disturb any serialization that relied on the attribute name.