feat(parser): remove step number prefixes from recipe extraction

- Update RECIPE_EXTRACTION_PROMPT to v2.1
- Remove instruction to number steps sequentially
- Update OUTPUT FORMAT and both few-shot examples
- Remove 'All steps numbered sequentially' from quality checklist
- Update fallback parser system prompt in parseRecipeWithStandardCompletion
- Frontend <ol> element already handles auto-numbering
- Tandoor integration unaffected (uses array index for step numbers)

Fixes double-numbering bug where steps appeared as '1. 1. Step text'
All 34 tests passing

Implementation follows execution plan in docs/plans/RemoveStepNumberPrefixes.md
Documented in docs/outcomes/RemoveStepNumberPrefixes.md

secrets/auth.json

@@ -5,7 +5,7 @@
       "value": "SDRORLyWEsWWty2ZoVGdER",
       "domain": ".instagram.com",
       "path": "/",
-      "expires": 1800846591.249928,
+      "expires": 1800848369.155388,
       "httpOnly": false,
       "secure": true,
       "sameSite": "Lax"
@@ -45,7 +45,7 @@
       "value": "59661903731",
       "domain": ".instagram.com",
       "path": "/",
-      "expires": 1774062591.25003,
+      "expires": 1774064369.155498,
       "httpOnly": false,
       "secure": true,
       "sameSite": "None"
@@ -55,21 +55,11 @@
       "value": "1280x720",
       "domain": ".instagram.com",
       "path": "/",
-      "expires": 1766891391,
+      "expires": 1766893170,
       "httpOnly": false,
       "secure": true,
       "sameSite": "Lax"
     },
-    {
-      "name": "rur",
-      "value": "\"CLN\\05459661903731\\0541797822590:01fead5659017d4efdfdc9bb90a2cf855f93490046a238de613e340be499e36e5962d8bb\"",
-      "domain": ".instagram.com",
-      "path": "/",
-      "expires": -1,
-      "httpOnly": true,
-      "secure": true,
-      "sameSite": "Lax"
-    },
     {
       "name": "sessionid",
       "value": "59661903731%3AbekaIlo4nn7x2n%3A29%3AAYig82sWcnm2bGaQlry72PN7OrhFZ4YYZt4_qM78dA",
@@ -79,6 +69,16 @@
       "httpOnly": true,
       "secure": true,
       "sameSite": "Lax"
+    },
+    {
+      "name": "rur",
+      "value": "\"CLN\\05459661903731\\0541797824369:01fe8c862f2dd54b808a334f6088f2bf4dad9b4c8965f2abd3762be986fe5c03e8e410df\"",
+      "domain": ".instagram.com",
+      "path": "/",
+      "expires": -1,
+      "httpOnly": true,
+      "secure": true,
+      "sameSite": "Lax"
     }
   ],
   "origins": [
@@ -87,7 +87,7 @@
       "localStorage": [
         {
           "name": "chatd-deviceid",
-          "value": "60986038-5bc5-49ed-80c4-d723c6d5ea59"
+          "value": "712a4dc5-cc51-4b0c-a373-611ef9b65c23"
         },
         {
           "name": "hb_timestamp",
@@ -95,7 +95,7 @@
         },
         {
           "name": "IGSession",
-          "value": "6m2tlb:1766288392093"
+          "value": "6m2tlb:1766290170601"
         },
         {
           "name": "pixel_fire_ts",
@@ -107,7 +107,7 @@
         },
         {
           "name": "Session",
-          "value": "0c19f1:1766286627093"
+          "value": "wayu8j:1766288405601"
         },
         {
           "name": "has_interop_upgraded",