fix(openapi): allow 128MB memory limits and add CI to RunOrigin enum (#2559)

Two schema mismatches with the live API:

1. **`ActorDefinition.minMemoryMbytes` / `maxMemoryMbytes`** required
`>= 256`, but actors actually run with 128 MB (the real platform
minimum, consistent with `RunOptions.memoryMbytes: minimum 128`).
Affected at least 20 store actors (`apify/instagram-profile-scraper`,
all of `apimaestro/*`, `harvestapi/*`, …).
2. **`RunOrigin`** enum was missing `CI`. `apify/cheerio-scraper` and
other Apify-owned actors have builds with `meta.origin: "CI"` from the
internal CI pipeline.

Author: vdusek

apify-api/openapi/components/schemas/actor-runs/RunOrigin.yaml

@@ -9,4 +9,5 @@ enum:
   - WEBHOOK
   - ACTOR
   - CLI
+  - CI
   - STANDBY

apify-api/openapi/components/schemas/actors/ActorDefinition.yaml

@@ -51,11 +51,11 @@ properties:
     description: Specifies the default amount of memory in megabytes to be used when the Actor is started. Can be an integer or a [dynamic memory expression](/platform/actors/development/actor-definition/dynamic-actor-memory).
   minMemoryMbytes:
     type: integer
-    minimum: 256
+    minimum: 128
     description: Specifies the minimum amount of memory in megabytes required by the Actor.
   maxMemoryMbytes:
     type: integer
-    minimum: 256
+    minimum: 128
     description: Specifies the maximum amount of memory in megabytes required by the Actor.
   usesStandbyMode:
     type: boolean