feat(hermes): align provider schema with Hermes Agent 0.10.0

Hermes 0.10.0 tightened custom_providers validation (commit 2cdae233):
invalid base_urls are rejected, unknown fields produce warnings, and
new fields (rate_limit_delay, bedrock_converse, key_env) landed.

- Add bedrock_converse to the api_mode selector (and i18n labels)
- Expose rate_limit_delay in a provider-level advanced panel
- Validate base_url client-side (URL shape, template-token friendly)
- Drop per-model max_tokens — not in _VALID_CUSTOM_PROVIDER_FIELDS
- Round-trip test asserts set_provider preserves rate_limit_delay /
  key_env / any unknown forward-compat field

src/components/providers/forms/ProviderForm.tsx

@@ -1902,6 +1902,10 @@ export function ProviderForm({
               onApiModeChange={hermesForm.handleHermesApiModeChange}
               models={hermesForm.hermesModels}
               onModelsChange={hermesForm.handleHermesModelsChange}
+              rateLimitDelay={hermesForm.hermesRateLimitDelay}
+              onRateLimitDelayChange={
+                hermesForm.handleHermesRateLimitDelayChange
+              }
             />
           )}