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>

Dockerfile

@@ -44,6 +44,11 @@ RUN PIPX_HOME=/opt/pipx PIPX_BIN_DIR=/usr/local/bin pipx install --include-deps
 RUN curl -sL https://raw.githubusercontent.com/denisidoro/navi/master/scripts/install | BIN_DIR=/usr/local/bin bash 2>/dev/null \
     || echo "navi installation skipped (offline build)"
 
+# Install zk (wiki browser with [[wiki-links]], fzf search, backlinks)
+RUN curl -sL https://github.com/zk-org/zk/releases/latest/download/zk-linux-amd64.tar.gz \
+    | tar xz -C /usr/local/bin/ 2>/dev/null \
+    || echo "zk installation skipped (offline build)"
+
 # Create data directory and set permissions
 RUN mkdir -p /data \
     && chown remnux:remnux /data
@@ -67,6 +72,7 @@ ADD data/generated/tools.db /opt/remnux-docs/tools.db
 ADD data/generated/cheatsheets/ /opt/cheatsheets/personal/
 ADD data/generated/workflows/ /opt/remnux-docs/workflows/
 ADD cheatsheets/ /opt/cheatsheets/
+ADD data/generated/wiki/ /opt/wiki/
 
 # Install legacy help scripts (kept for compatibility)
 ADD scripts/create-offline-help-system.sh /usr/local/bin/create-offline-help-system.sh