fix(mcp): OAuth2 chat connect - tools fetch, auth flow, and status fixes

- schema.prisma: add missing MCP table fields (approval_status, submitted_by, submitted_at, reviewed_at, review_notes) to prevent destructive migrations
- rest_endpoints.py: inject user OAuth token via extra_headers for OAuth2 servers so tools list is populated; add server name->UUID resolution so MCPConnectPicker name lookups work
- mcp_registry.json: fix Atlassian defaults (transport: http, url: .../v1/mcp)
- ChatPage.tsx: read mcpOauthReturn param to init sidebarView="apps" on OAuth return, clean up param after mount
- MCPAppsPanel.tsx: auto-add OAuth2 servers to selectedServers when credential detected; onConnect also enables server for chat; disconnect removes from selectedServers
- mcp_servers.tsx: sort servers by created_at DESC
- useUserMcpOAuthFlow.tsx: append mcpOauthReturn=apps to return URL so Apps panel is mounted on return

litellm-proxy-extras/litellm_proxy_extras/schema.prisma

@@ -315,6 +315,11 @@ model LiteLLM_MCPServerTable {
   is_byok               Boolean  @default(false)
   byok_description      String[] @default([])
   byok_api_key_help_url String?
+  approval_status       String    @default("approved")
+  submitted_by          String?
+  submitted_at          DateTime?
+  reviewed_at           DateTime?
+  review_notes          String?
 }
 
 // Per-user BYOK credentials for MCP servers