feat(seo-data): GSC Search Analytics + URL Inspection with lazy OAuth refresh

lib/seo-data/fixtures/gsc_inspect.json

@@ -0,0 +1,2 @@
+{"inspectionResult":{"indexStatusResult":{
+  "verdict":"PASS","coverageState":"Submitted and indexed","lastCrawlTime":"2026-07-01T10:00:00Z"}}}

lib/seo-data/fixtures/gsc_queries.json

@@ -0,0 +1,3 @@
+{"rows":[
+  {"keys":["plombier paris"],"clicks":40,"impressions":900,"ctr":0.044,"position":6.3},
+  {"keys":["urgence fuite"],"clicks":5,"impressions":1200,"ctr":0.004,"position":8.9}]}