feat: complete project firewall-rule-engine

PROJECTS/beginner/firewall-rule-engine/.gitignore

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+# ©AngelaMos | 2026
+# .gitignore
+
+# Build
+bin/
+*.o
+*.so
+*.out
+*.tmp.c
+
+# V internals
+.cache/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Development reference (local only)
+vlang-reference/

PROJECTS/beginner/firewall-rule-engine/Justfile

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+# ©AngelaMos | 2026
+# Justfile
+
+set shell := ["bash", "-uc"]
+
+project := "fwrule"
+version := "1.0.0"
+src     := "src/"
+bin     := "bin/" + project
+
+default:
+    @just --list --unsorted
+
+[group('build')]
+build:
+    v -o {{bin}} {{src}}
+
+[group('build')]
+release:
+    v -prod -o {{bin}} {{src}}
+    @ls -lh {{bin}}
+
+[group('test')]
+test:
+    v test {{src}}
+
+[group('test')]
+test-verbose:
+    v -stats test {{src}}
+
+[group('dev')]
+fmt:
+    v fmt -w {{src}}
+
+[group('dev')]
+fmt-check:
+    v fmt -verify {{src}}
+
+[group('dev')]
+run *ARGS:
+    v -o {{bin}} {{src}} && ./{{bin}} {{ARGS}}
+
+[group('dev')]
+load FILE:
+    @just run load {{FILE}}
+
+[group('dev')]
+analyze FILE:
+    @just run analyze {{FILE}}
+
+[group('dev')]
+harden *ARGS:
+    @just run harden {{ARGS}}
+
+[group('dev')]
+export FILE *ARGS:
+    @just run export {{FILE}} {{ARGS}}
+
+[group('dev')]
+diff F1 F2:
+    @just run diff {{F1}} {{F2}}
+
+[group('util')]
+clean:
+    rm -rf bin/
+    find . -name '*.tmp.c' -delete
+
+[group('util')]
+info:
+    @echo "{{project}} v{{version}}"
+    @echo "V compiler: $(v version)"
+    @echo "Platform:   $(uname -s)/$(uname -m)"
+
+[group('util')]
+smoke: build
+    ./{{bin}} version
+    ./{{bin}} help
+    ./{{bin}} load testdata/iptables_basic.rules
+    ./{{bin}} load testdata/nftables_basic.rules
+    ./{{bin}} analyze testdata/iptables_conflicts.rules
+    ./{{bin}} harden -s ssh,http,https -f iptables
+    ./{{bin}} harden -s ssh,http,https -f nftables
+    ./{{bin}} export testdata/iptables_basic.rules -f nftables
+    ./{{bin}} diff testdata/iptables_basic.rules testdata/nftables_basic.rules
+    @echo "All smoke tests passed"