fix(hubble): support anonymous mode and cluster-ready graph creation

[looksaw2]

Summary

• establish an explicit anonymous Hubble session when Server authentication is disabled instead of calling /auth/login
• expose anonymous GraphSpace/resource capabilities to the UI without inventing a Server token
• wait for PD-backed graphs to report READY on every registered Server before returning create success
• show live ready_count/expected_count progress while Hubble is waiting
• preserve compatibility with 1.5/1.7 Servers that do not expose the readiness endpoint, with an explicit warning and no false guarantee

Verification

• Hubble backend full unit suite: 470 tests, 0 failures, 0 errors
• Client/readiness focused reactor: 27 tests, 0 failures, 0 errors
• Frontend Graph/Login/auth contract: 58 tests, 0 failures
• Hubble distribution package: BUILD SUCCESS (Client/Loader installed first per repository build instructions)
• no-auth browser flow previously verified for Graph, Schema, Gremlin, and Loader in the isolated test namespace

Server dependency

Cluster-wide readiness counts require hugegraph/hugegraph#200. Older Servers continue to create graphs, but Hubble logs that cross-replica readiness cannot be guaranteed.

Related: apache/hugegraph#3137

[coderabbitai]

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[github-actions]

Due to the lack of activity, the current pr is marked as stale and will be closed after 180 days, any update will remove the stale label