chore: remove legacy alias env vars from env-builder

Drop 4 backward-compat aliases superseded by canonical vars:
- GOOGLE_API_KEY → use GEMINI_API_KEY
- GOOGLE_API_KEYS → use GEMINI_API_KEYS
- CLOUDFLARE_API_TOKEN → use CLOUDFLARE_WORKERS_TOKEN
- BACKUP_DATASET → use BACKUP_DATASET_NAME

152 → 148 fields.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

env-builder.js

@@ -924,15 +924,6 @@ const FIELDS = [
     "secret": 1,
     "common": 0
   },
-  {
-    "g": "Provider Keys",
-    "icon": "🔑",
-    "k": "GOOGLE_API_KEY",
-    "lbl": "Google AI Studio",
-    "type": "password",
-    "secret": 1,
-    "common": 0
-  },
   {
     "g": "Provider Keys",
     "icon": "🔑",
@@ -1167,15 +1158,6 @@ const FIELDS = [
     "secret": 1,
     "common": 0
   },
-  {
-    "g": "Provider Keys",
-    "icon": "🔑",
-    "k": "CLOUDFLARE_API_TOKEN",
-    "lbl": "Cloudflare API token",
-    "type": "password",
-    "secret": 1,
-    "common": 0
-  },
   {
     "g": "Rotation Pools",
     "icon": "🔄",
@@ -1197,13 +1179,6 @@ const FIELDS = [
     "lbl": "Gemini pool",
     "type": "text"
   },
-  {
-    "g": "Rotation Pools",
-    "icon": "🔄",
-    "k": "GOOGLE_API_KEYS",
-    "lbl": "Google pool",
-    "type": "text"
-  },
   {
     "g": "Rotation Pools",
     "icon": "🔄",
@@ -1650,14 +1625,6 @@ const FIELDS = [
     "type": "text",
     "ph": "/app"
   },
-  {
-    "g": "Deployment",
-    "icon": "🧭",
-    "k": "BACKUP_DATASET",
-    "lbl": "Backup dataset alias",
-    "type": "text",
-    "ph": "huggingclaw-backup"
-  },
   {
     "g": "Deployment",
     "icon": "🧭",