refactor: enhance platform configuration, database schema handling, and Keycloak setup

Improved `PlatformConfig` API base URL resolution with enhanced logging and fallback logic. Revised database initialization with version checks, schema migration, and error handling. Updated Keycloak configuration to enable `Direct Access Grants` and refine CORS/redirect settings. Adjusted Webpack proxy settings for correct API routing.

config/docker/keycloak/meldestelle-realm.json

@@ -92,7 +92,9 @@
       "webOrigins": [
         "http://localhost:8081",
         "http://localhost:3000",
-        "https://app.meldestelle.at"
+        "https://app.meldestelle.at",
+        "http://localhost:8080",
+        "*"
       ],
       "protocol": "openid-connect",
       "bearerOnly": false,
@@ -189,7 +191,7 @@
       "publicClient": true,
       "standardFlowEnabled": true,
       "implicitFlowEnabled": false,
-      "directAccessGrantsEnabled": false,
+      "directAccessGrantsEnabled": true,
       "redirectUris": [
         "http://localhost:8080/*",
         "http://localhost:4000/*",
@@ -200,7 +202,8 @@
         "http://localhost:8080",
         "http://localhost:4000",
         "http://localhost:3000",
-        "https://app.meldestelle.at"
+        "https://app.meldestelle.at",
+        "*"
       ],
       "protocol": "openid-connect",
       "attributes": {