Add markdown wiki with 473 pages and zk browser

Generate interlinked wiki from master inventory: 397 tool pages,
15 workflow pages, 27 recipe pages, 33 category pages, plus index.
All pages use [[wiki-links]] for cross-navigation between tools,
workflows, recipes, and categories (1782 links total).

Install zk for interactive browsing with fzf search, tag filtering,
and backlink discovery. Add 'fhelp wiki' command and Makefile target.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

data/generated/wiki/tools/nginx.md

@@ -0,0 +1,14 @@
+# nginx
+> Web server.
+
+**Category:** [[categories/explore-network-interactions-services|Explore Network Interactions > Services]] | **Tier:** Standard (docs)
+**Docs:** [https://docs.remnux.org/discover-the-tools/explore+network+interactions/services](https://docs.remnux.org/discover-the-tools/explore+network+interactions/services)
+
+## Related Tools
+- [[tools/dnsresolver|dnsresolver.py]] — DNS resolver tool for dynamic analysis with wildcard and tra
+- [[tools/fakedns|fakedns]] — Fake DNS server that resolves all queries to a specified IP 
+- [[tools/fakemail|fakemail]] — Intercept and examine SMTP email activity with this fake SMT
+- [[tools/fakenet-ng|fakenet-ng]] — Emulate network services (HTTP, DNS, SMTP, FTP) to intercept
+- [[tools/httpd|httpd]] — Simple HTTP server on REMnux for simulating C2 web servers
+
+#explore-network-interactions-services