Align guide docs with the code on main

[aram356]

Summary

• A page-by-page audit of docs/guide against the current crates found names that no longer exist, behaviour the code contradicts, and public surface with no coverage. This PR fixes what the audit turned up, so a reader following the guides lands on APIs and commands that exist and behave as described.
• The audit ran as a rerunnable identifier/flag/link cross-check over every page plus a source-cited review per page group; 66 findings landed, each verified against the cited source line before editing.

Changes

Crate / File	Change
docs/guide/adapters/fastly.md	Replace phantom dispatch_with_config* with the FastlyService builder; add Custom entry points (runtime_env_config, dispatch_with_registries, RUNTIME_ENV_STORE_NAME, both footguns); buffering, -C, manifest_version = 3, [setup], proxy:: import
docs/guide/adapters/cloudflare.md	CloudflareService builder; worker-build build command; context:: / proxy:: imports; wrangler kv key put; Secret Store section; kv/config merged-id collision
docs/guide/adapters/axum.md	dev_server::run_app, AxumProxyClient::try_new(), bind-address precedence, EDGEZERO__LOGGING__LEVEL, owns_logging; KV Storage and Secret Store sections; KV no longer listed as unavailable
docs/guide/adapters/spin.md	Logging, Proxy Client, Context Access, Testing sections; required = true vs default = ""
docs/guide/adapters/overview.md	Streaming current state, proxy-header and logging lists include Spin, Spin Tests, Store Capabilities table, Adapter trait hooks in onboarding
docs/guide/streaming.md, proxying.md	Only Cloudflare preserves progressive delivery; SpinProxyClient, AxumProxyClient::try_new()?
docs/guide/routing.md, handlers.md, middleware.md, kv.md	Duplicate routes panic at build; Store Extractors (Kv, Config, Secrets, AppConfig<C>); FnMiddleware / middleware_arc; Axum KV file naming
docs/guide/configuration.md	app! argument table; adapter metadata component / host / port; auth-* command overrides; rename_all and store_ref rules; compiling secret-resolution example
docs/guide/blob-app-config-migration.md	config push --staging as the supported staging path; Axum env-var and wrangler secret put forms; canary key in examples; config.rs diff entry point
docs/guide/manifest-store-migration.md	EDGEZERO__LOGGING__* rows; drop dispatch_with_*_handle
docs/guide/cli-reference.md, cli-walkthrough.md	-C / --manifest-path serve and deploy forms; healthcheck outputs and token behaviour; Cloudflare --binding --local; pushed-key / pushed-store; EDGEZERO_MANIFEST scope; my-app.toml in the tree; lifecycle commands in the generated CLI
docs/guide/deploy-github-actions.md, docs/specs/edgezero-deploy-github-action.md	cache/restore@v6 + cache/save@v6, no checkout; cache-key components; artifact retention and job summary
docs/guide/architecture.md, what-is-edgezero.md, roadmap.md, docs/index.md	Spin in the layout, adapter list, feature table, platform table, feature cards; Spin moved to Completed; dispatch_with_config dropped from the diagram
docs/.vitepress/config.mts	KV Storage added to the sidebar
crates/edgezero-adapter-axum/src/key_value_store.rs	Module doc: .edgezero/kv-<slug>-<hash>.redb, not the removed .edgezero/kv.redb default

Closes

Closes #372
Closes #361
Closes #77

Test plan

• cargo fmt --all -- --check
• Docs build: cd docs && npm run lint && npm run format && npm run build
• Other: every behavioural claim edited was checked against the cited source line; the identifier/flag/link cross-check over docs/guide reports only placeholder app names and third-party names
• cargo test --workspace --all-targets (no Rust code changed; one //! comment)
• cargo clippy --workspace --all-targets --all-features -- -D warnings (not applicable)
• cargo check --workspace --all-targets --features "fastly cloudflare spin" (not applicable)
• WASM builds (not applicable)
• examples/app-demo workspace (not applicable)
• Manual testing via edgezero serve --adapter axum (not applicable)

Checklist

• Changes follow CLAUDE.md conventions
• No Tokio deps added to core or adapter crates
• Route params use {id} syntax (not :id)
• Types imported from edgezero_core (not http crate)
• Store wiring goes through KvRegistry / ConfigRegistry / SecretRegistry (not the legacy single-handle setters) — see spec §6.6
• New code has tests (docs only)
• No secrets or credentials committed