refactor!: retire legacy operator stake indexing

[mswilkison]

Operator registration currently depends on a prior positive TokenStaking record, even though node participation has moved to DAO-managed allowlist weights. The schema also exposes obsolete stake balances and totals. This cleanup indexes operators without economic staking while preserving wallet/group history, rewards, and existing fault telemetry.

• Remove legacy stake balances, roles, stake events, and stake/bond statistics; rename authorization amount fields to reported weights.
• Record registration without a stake prerequisite, retain first registration time and each application's operator identity, and remove the obsolete token threshold.
• Replace aggregate authorization values from the previously indexed value, so migration callbacks from zero and repeated decrease requests do not double count.
• Reduce TokenStaking to a single TokensSeized telemetry handler. Preserve raw amount, discrepancy, and emitter without changing balances or duplicating application fault counters.
• Add 12 mapping regression tests and run them in the shared CI/deploy build gate.

Breaking schema: field replacements, weight semantics (including pending decrease requests), and the release checklist are in operator-staking-retirement.md. The new version needs a full sync and a coordinated proxy cutover. Keep the previous published deployment queryable for historical stake queries and rollback. No deployment or production cutover is performed by this PR.

This PR is independent of #24; user rebate staking is unaffected. The two branches merge cleanly in a local validation checkout; codegen, both network builds, and all 17 mapping tests pass together. Explorer companion PR #454 removes the unused group-detail query requesting retired fields; the active wallet fallback's group/public-key query is preserved. The Explorer migration remains in dApp #453.

Validation: codegen, mainnet and Sepolia builds, all 12 new mapping tests, and all 58 existing toolchain/cutover tests pass locally.

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