cmd_fsck: use access_local(), remove dead AnyView::load()

Convert cmd_fsck to async and use access_local() for the cached store.
Still uses Store::load_from_logs() for fresh comparison.

Remove unused AnyView::load() method - was never called.

Remaining Store::load() calls are all internal caching infrastructure:
- persist.rs cached() for CACHED_STORE
- mod.rs access() fallback for STORE_ACCESS

Co-Authored-By: Proof of Concept <poc@bcachefs.org>

src/hippocampus/store/view.rs

@@ -6,7 +6,6 @@
 
 use super::types::*;
 
-use anyhow::Result;
 use std::fs;
 
 // ---------------------------------------------------------------------------
@@ -185,17 +184,6 @@ pub enum AnyView {
     Owned(Store),
 }
 
-impl AnyView {
-    /// Load the fastest available view: mmap snapshot or owned store.
-    pub fn load() -> Result<Self> {
-        if let Some(mv) = MmapView::open() {
-            Ok(AnyView::Mmap(mv))
-        } else {
-            Ok(AnyView::Owned(Store::load()?))
-        }
-    }
-}
-
 impl StoreView for AnyView {
     fn for_each_node<F: FnMut(&str, &str, f32)>(&self, f: F) {
         match self { AnyView::Mmap(v) => v.for_each_node(f), AnyView::Owned(s) => s.for_each_node(f) }