docs: OpenCPU, OpenMemory, OpenGPU and OpenBandwidth, the resources of a server purchase (#163)

Four resource specifications under OpenServer, one per thing that is
negotiable when a server is bought. Each is the block of an OpenServer
offer (compute, memory, gpu, network) written down on its own, with the
units OpenServer 0.1 already uses (vcpu, cores, ram_mb, vram_mb,
bandwidth_mbps, transfer_gb, ipv4, ipv6) and one new shape shared by all
four: `range`, the field a buyer can dial at checkout, its bounds, the
step and what a step costs on top of the base price.

- OpenCPU: threads against cores, the processor by its vendor name,
  dedicated, shared or burstable allocation.
- OpenMemory: mebibytes, DDR generation, ECC as three states, reserved,
  balloonable or shared; wins over compute.ram_mb when both are present.
- OpenGPU: the card by its vendor name, count and VRAM per device,
  interconnect, passthrough, MIG, vGPU or shared access.
- OpenBandwidth: port, four meters (transfer, unmetered, percentile,
  flat), overage, IPv4 and IPv6 addresses as a priced resource.

A provider that sells only one resource lists it as an OpenServer offer
and may serve the same document at /.well-known/<slug>.json. Landing
pages share one component (resource-spec-page.tsx). Registered in
DOC_SLUGS, NAV, STATIC_ROUTES and llms.txt. OpenServer, OpenFile and
OpenDisk arrive in sibling PRs.


Claude-Session: https://claude.ai/code/session_014cmNRtR2vL1p89dbVQ7FZJ

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

apps/logicsrc-web/src/components/site-shell.tsx

@@ -18,6 +18,10 @@ const NAV: Array<{ href: string; label: string; external?: boolean }> = [
   { href: "/openmcp", label: "OpenMCP" },
   { href: "/openaccess", label: "OpenAccess" },
   { href: "/openserver", label: "OpenServer" },
+  { href: "/opencpu", label: "OpenCPU" },
+  { href: "/openmemory", label: "OpenMemory" },
+  { href: "/opengpu", label: "OpenGPU" },
+  { href: "/openbandwidth", label: "OpenBandwidth" },
   { href: "/#cli", label: "CLI" },
   { href: "/docs", label: "Docs" },
   { href: "/blog", label: "Blog" },