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* admin: count plugin-runtime workers in worker metrics The admin server keeps two worker registries: the legacy maintenance-worker map, filled by workers registering over the worker gRPC stream, and the plugin worker registry, filled by workers started as `weed worker`. Both the SeaweedFS_admin_workers_connected / SeaweedFS_admin_worker_slots gauges and the dashboard's Workers card read only the legacy map, so a cluster that runs the admin and its workers as separate components reported 0 workers even while its workers showed up on the plugin pages and ran scheduled jobs. Aggregate both registries instead. The two are merged by worker ID: `weed mini` starts both runtimes out of one working directory, so they share the persisted worker ID and must not be counted twice. For such a worker the slot numbers still come from the legacy registry, which keeps mini's existing readings. Plugin workers report their slots in the heartbeat, so detection and execution slots are summed from there; a worker that has connected but not yet sent a heartbeat counts as connected with zero slots. Fixes #10525 * admin: clamp negative worker-reported slot values in metrics merge A plugin worker's self-reported heartbeat slot counts are untrusted input; clamp them to 0 before summing so a stale or misbehaving worker can't drive the aggregate gauge negative, matching the same defensiveness already used in registry.go's own slot arithmetic.