Rebrand StreamHoard, strip Emergent.sh platform artifacts

- Remove .emergent/ state dir, tracked .gitconfig, @emergentbase/visual-edits
  dep + craco wiring, emergent.sh script/meta tags, PostHog telemetry snippet
- Rename UI/docs branding Kino -> StreamHoard (README, DEPLOY.md, Navbar,
  Login, Register, AdminShowEpisodes, FastAPI title, health check response)
- Rename docker-compose container/network names to streamhoard-*
- Default admin email domain -> admin@streamhoard.local

frontend/craco.config.js

@@ -2,10 +2,6 @@
 const path = require("path");
 require("dotenv").config();
 
-// Check if we're in development/preview mode (not production build)
-// Craco sets NODE_ENV=development for start, NODE_ENV=production for build
-const isDevServer = process.env.NODE_ENV !== "production";
-
 // Environment variable overrides
 const config = {
   enableHealthCheck: process.env.ENABLE_HEALTH_CHECK === "true",
@@ -81,20 +77,4 @@ webpackConfig.devServer = (devServerConfig) => {
   return devServerConfig;
 };
 
-// Wrap with visual edits (automatically adds babel plugin, dev server, and overlay in dev mode)
-if (isDevServer) {
-  try {
-    const { withVisualEdits } = require("@emergentbase/visual-edits/craco");
-    webpackConfig = withVisualEdits(webpackConfig);
-  } catch (err) {
-    if (err.code === 'MODULE_NOT_FOUND' && err.message.includes('@emergentbase/visual-edits/craco')) {
-      console.warn(
-        "[visual-edits] @emergentbase/visual-edits not installed — visual editing disabled."
-      );
-    } else {
-      throw err;
-    }
-  }
-}
-
 module.exports = webpackConfig;