vault backup: drop browser-profile junk from vault root, keep real note changes, add .gitignore

.gitignore

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+# ── 浏览器 user-data-dir 误指向库目录时产生的垃圾（2026-11-05 事故）──
+# Chrome 156 / Edge 149 曾被以 --user-data-dir=F:\AI\Obsidian 启动，
+# 把整套浏览器 profile 倒进库根目录，并被 obsidian-git 自动备份提交。
+# 永远不要把浏览器的 profile（--user-data-dir）指向 Obsidian 库目录。
+/Local State
+/Variations
+/Last Browser
+/Last Version
+/FirstLaunchAfterInstallation
+/first_party_sets.db
+/first_party_sets.db-journal
+/BrowserMetrics-spare.pma
+/CrashpadMetrics-active.pma
+/BrowserMetrics/
+/Crashpad/
+/Default/
+/ShaderCache/
+/GrShaderCache/
+/GPUPersistentCache/
+/GraphiteDawnCache/
+/DawnGraphiteCache/
+/DawnWebGPUCache/
+/WidevineCdm/
+/component_crx_cache/
+/extensions_crx_cache/
+/SwReporter/
+/TreeModelCache/
+/CertificateRevocation/
+/Subresource Filter/
+/Trust Protection Lists/
+/TrustTokenKeyCommitments/
+/FirstPartySetsPreloaded/
+/Safe Browsing/
+/SafetyTips/
+/SmartScreen/
+/SSLErrorAssistant/
+/FileTypePolicies/
+/MEIPreload/
+/OriginTrials/
+/PKIMetadata/
+/Crowd Deny/
+/Ad Blocking/
+/Autofill/
+/CaptchaProviders/
+/Typosquatting/
+/Web Notifications Deny List/
+/Well Known Domains/
+/Domain Actions/
+/PersistentOriginTrials/
+/hyphen-data/
+/OnDeviceHeadSuggestModel/
+/OptimizationHints/
+/OptimizationGuideModelsManifest/
+/segmentation_platform/
+/Speech Recognition/
+/WasmTtsEngine/
+/ZxcvbnData/
+/WorkspacesNavigationComponent/
+/RecoveryImproved/
+/ProvenanceData/
+/ProvenanceDataAllowList/
+/ProvenanceDataTensors/
+/PrivacySandboxAttestationsPreloaded/
+/AmountExtractionHeuristicRegexes/
+/AutoLaunchProtocolsComponent/
+/Nurturing/
+/Edge Wallet/
+/Edge Shopping/
+/Edge Sidebar/
+/Edge Notifications/
+/Edge Signal Triggers/
+/Edge Entity Extraction/
+/Edge Data Protection Lists/
+/EdgeLanguageDetectionModel/
+/EdgeArbitration/
+/Edge3pSerp/
+/EADPData Component/
+/DualEngine/