feat: add admin/internal database API with CRUD, read-only query, and natural-language SQL endpoints

Add a new `/dbapi` router package providing a generic database API over `dataset`, restricted to admin sessions, admin API keys, and the internal gateway key. Includes:

- `tables.py`: list all tables and inspect table schemas
- `crud.py`: full CRUD operations (GET, POST, PATCH, DELETE) with soft-delete awareness, born-live inserts, `?include_deleted`, `.../restore`, and `?hard=true` purge
- `query.py`: validated read-only SELECT execution via sqlglot parsing, classification, and EXPLAIN dry-run; async query jobs with WebSocket streaming via `DbApiJobService`
- `nl.py`: natural-language-to-SQL conversion using the platform AI gateway with re-prompting until validation passes

Also register `DbApiJobService` and `PubSubService` in the service manager, add `DBAPI_DIR` to config data paths, and force cleartext `http://` connections to HTTP/1.1 in `curl_transport` to fix large request failures against uvicorn's HTTP/1.1-only internal gateway.

devplacepy/static/js/Application.js

@@ -30,6 +30,7 @@ import { IssueReporter } from "./IssueReporter.js";
 import { MediaGallery } from "./MediaGallery.js";
 import WindowManager from "./components/WindowManager.js";
 import { ContainerTerminalManager } from "./ContainerTerminalManager.js";
+import { PubSubClient } from "./PubSubClient.js";
 
 class Application {
     constructor() {
@@ -67,6 +68,7 @@ class Application {
         this.projectForker = new ProjectForker();
         this.issueReporter = new IssueReporter();
         this.mediaGallery = new MediaGallery();
+        this.pubsub = new PubSubClient();
     }
 }