feat: live HA cluster scaling controller - #1051
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Ports the dashboard's useScaleHACluster against the CLI's environment-config types: scaling up clones a live sibling's shape (image, decrypted variables, volume mount) into a brand-new service+volume; scaling down removes the highest-numbered nodes, never the primary coordinator; every change restamps the cluster's declared wiring on survivors. Edge nodes scale as plain region replica counts. After committing, the new members' parent links are re-verified: the public patch path silently drops parentServiceId (confirmed live), and the CLI warns loudly instead of letting the orphaned-topology surprise land later. Part 5/8 of the railway postgres pitr/ha/pgbouncer stack.
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Part 5/8 of the railway postgres pitr/ha/pgbouncer stack (split out of #1032 for reviewability — see that PR for the full context, live-prod e2e evidence, and the test-postgres-cli harness). Each PR is based on the previous one and is independently green (cargo test/clippy/fmt).
Ports the dashboard's useScaleHACluster against the CLI's environment-config
types: scaling up clones a live sibling's shape (image, decrypted variables,
volume mount) into a brand-new service+volume; scaling down removes the
highest-numbered nodes, never the primary coordinator; every change restamps
the cluster's declared wiring on survivors. Edge nodes scale as plain region
replica counts. After committing, the new members' parent links are
re-verified: the public patch path silently drops parentServiceId (confirmed
live), and the CLI warns loudly instead of letting the orphaned-topology
surprise land later.
Part 5/8 of the railway postgres pitr/ha/pgbouncer stack.