feat: compare limit 9, format-aware import placeholder, help links

- Raise compare limit from 8 to 9 (server + client, toast on overflow)
- Make import textarea placeholder match selected format (CSV/JSON/YAML/auto)
- Add GuideHelp links to admin create/edit user dialogs and tool import dialog

artifacts/toolrate/src/i18n/locales/en.json

@@ -101,6 +101,7 @@
     "compareCount": "Compare ({{count}})",
     "addToCompare": "Add to compare",
     "removeFromCompare": "Remove from compare",
+    "compareLimitReached": "A maximum of 9 tools can be compared.",
     "comparePremiumTitle": "Compare is a Premium feature",
     "comparePremiumSub": "Comparing tools side-by-side is available to Premium and Enterprise users. Upgrade your plan to unlock it.",
     "notNow": "Not now",
@@ -418,6 +419,10 @@
     "importYamlSub": "A YAML list of objects (or a single object) with the fields name, description, category, websiteUrl, iconUrl, features, tags.",
     "importFile": "Upload file",
     "importTextareaPlaceholder": "name;description;category;features;tags\nMy Tool;A great description;Monitoring;Deployment|Open Source;devops",
+    "importTextareaPlaceholderCsv": "name;description;category;features;tags\nMy Tool;A great description;Monitoring;Deployment|Open Source;devops",
+    "importTextareaPlaceholderJson": "[\n  {\n    \"name\": \"My Tool\",\n    \"description\": \"A great description\",\n    \"category\": \"Monitoring\",\n    \"features\": [\"Deployment\", \"Open Source\"],\n    \"tags\": [\"devops\"]\n  }\n]",
+    "importTextareaPlaceholderYaml": "- name: My Tool\n  description: A great description\n  category: Monitoring\n  features:\n    - Deployment\n    - Open Source\n  tags:\n    - devops",
+    "importTextareaPlaceholderAuto": "name;description;category\nMy Tool;A great description;Monitoring",
     "importing": "Importing…",
     "importDone": "{{count}} of {{total}} tools imported successfully.",
     "importErrors": "{{count}} rows with errors:",