fix(auth+cli): fail-closed site-scope gate (row 98); case-insensitive audit filter values with a strict server-side check (row 99)

Register row 98 — the site-scope authorization gate was FAIL-OPEN on an
unresolvable target. The resolve-then-check shape was written as
`if (target != null) EnforceSiteScope(...)`, so a null resolve skipped the
check entirely and a site-scoped caller passed the gate for any id in the
system. Authorization now fails CLOSED: a target that cannot be PROVEN to sit
inside the caller's scope is treated as outside it.

The defect turned out to have THREE more instances than the register recorded.
Besides `EnforceSiteScopeForInstance` and `EnforceSiteScopeForIdentifier`, the
same inline shape sat in `HandleGetInstance`, `HandleGetSite` and
`HandleGetDataConnection` — read handlers that resolve their own target and so
never call the helpers. Those were the sharper half of the bug: they answered
success-with-null for a nonexistent id and Unauthorized for an out-of-scope
one, making the pair an id-enumeration oracle over the whole fleet. All five
now route through one shared `DenyUnresolvedTargetIfScoped` arm.

Two properties are load-bearing and pinned by tests:
  - System-wide callers (Administrator, or a Deployer with no site grants) are
    untouched — they return at the guards above the lookup and keep the
    handler's ordinary "not found" / null answer.
  - The denial is indistinguishable from an out-of-scope denial: same
    ManagementUnauthorized shape, and a message that never states whether the
    target exists.

Register row 99 — CLI `audit query --status delivered` failed client-side while
the server would have accepted it: `AcceptOnlyFromAmong` matches ordinally
against the capitalised literals. Same treatment row 88 gave `deploy status` —
the client-side gate is removed, the valid set moves into the option help text,
and the server becomes the single authoritative check.

That required ADDING the server check, not just relying on one: the shared
audit filter parser was LAX, silently dropping an unrecognised value and
leaving the dimension unconstrained — so removing the CLI gate alone would have
turned a loud client-side failure into a plausible, complete-looking page that
did not answer the question asked. New `ParseEnumListStrict` (case-insensitive,
rejects ordinals — `Enum.TryParse` accepts "3", and a filter is a name-based
contract) backs the ManagementService /api/audit/query + /api/audit/export
endpoints, which now return 400 BAD_REQUEST naming the valid set.

Other AcceptOnlyFromAmong sites surveyed in the audit group: `--channel`,
`--kind`, `--status` on BOTH `query` and `export` (6 uses) plus `export
--format` (rejected `--format CSV` though the server lowercases it) — all seven
fixed here. Deliberately left alone: `template folder reorder --direction`
(pure client-side literal, no server-side parse to defer to) and the global
`--format json|table` (CLI-local output selection, never sent to a server).

The CentralUI AuditLogPage drill-in parser and the CentralUI export endpoint it
feeds deliberately KEEP the lax parse — they read a query string a human may
have bookmarked, where a stale fragment must still render the page. Both
contracts now live side by side in AuditQueryParamParsers and are documented as
non-reconcilable.

Docs: Component-ManagementService.md gains a "Site-scope gate: fail-closed on
an unresolvable target" section and a strict-filter note on the audit
endpoints; Component-Security.md records the fail-closed shape under Deployer
site scoping; the CLI README marks the audit filter values case-insensitive and
states the no-silent-drop / no-ordinals contract.

Tests: 5 new ManagementActorTests fail before the row-98 fix (verified by
reverting ManagementActor.cs) and cover scoped+nonexistent -> denied,
system-wide+nonexistent -> unchanged (both Administrator and no-grant Deployer),
scoped+in-scope -> allowed, and the indistinguishability property. 21 CLI tests
fail before the row-99 fix. Four pre-existing tests that pinned the removed
client-side gate were rewritten to pin the new contract.

docs/requirements/Component-Security.md

@@ -117,6 +117,7 @@ Set in a local or docker-dev environment via the environment variable `ScadaBrid
   - View site event logs.
 - **Site scoping**: A user with site-scoped Deployer role can only perform these actions for instances at their permitted sites.
 - **Administrator overrides site scoping.** A user who holds `Administrator` is system-wide **regardless of the `SiteId` claims they carry** — a scoped Deployer grant does not narrow an Administrator. This is enforced identically on both surfaces: `ManagementActor.EnforceSiteScope` (CLI / HTTP management API) and the Central UI's `SiteScopeService`. The two disagreed until deferred-work register row 86 — the UI was claims-only, so the same user saw the whole fleet through the CLI and only their sites in the UI. **No other role carries this bypass**; in particular `Designer` does not (Designer has no site-scoped permissions to bypass in the first place).
+- **The scope check fails CLOSED on an unresolvable target.** Site scoping works by resolving the command's target (instance id, site id/identifier, data-connection id) and comparing its site to the permitted set. When the target does not resolve, a **site-scoped caller is DENIED** — the same `Unauthorized` result an out-of-scope target produces. The rule is *a target that cannot be PROVEN to sit inside the caller's scope is treated as outside it*; it fails open only for callers who were never scoped (Administrator, or a Deployer with no site grants), who keep their ordinary "not found" answer. The check was fail-open until deferred-work register row 98, which also made the denial **indistinguishable from an out-of-scope denial** — same response shape, and a message that never says whether the target exists — so a scoped caller cannot use the gate to enumerate ids across the fleet. See `Component-ManagementService.md` → *Site-scope gate: fail-closed on an unresolvable target*.
 
 > **Area management (arch-review C6)**: Managing area definitions per site is gated **any-of [Designer, Deployer]**, not Administrator. Areas are authored both in the Designer tooling and inside the Central UI Deployment Topology workflow (`Topology.razor` is `RequireDeployment`), so either role qualifies; Administrator is not implicitly included in the actor gate.