docs: add comprehensive advanced features guide

[thkruz]

Add detailed guide showcasing OOTK's unique capabilities beyond SGP4:

• High-fidelity numerical propagation with force models
• Initial orbit determination (Lambert, Gibbs, Herrick-Gibbs, Gooding)
• Sensor operations and pass prediction
• Astronomical calculations (Sun, Moon, eclipses)
• Advanced coordinate transformations (15+ systems)
• Force modeling (gravity harmonics, drag, SRP, third-body)
• Maneuver planning and optimization
• Covariance and uncertainty analysis
• Multiple time systems (UTC, GPS, TAI, TDB, TT)
• Relative motion analysis (RIC, Hill frames)

Includes practical code examples and performance considerations for professional orbital mechanics applications.

[github-actions]

# npm audit report

brace-expansion  1.0.0 - 1.1.11
brace-expansion Regular Expression Denial of Service vulnerability - https://github.com/advisories/GHSA-v6h2-p8h4-qcjw
fix available via `npm audit fix`
node_modules/brace-expansion

js-yaml  <3.14.2 || >=4.0.0 <4.1.1
Severity: moderate
js-yaml has prototype pollution in merge (<<) - https://github.com/advisories/GHSA-mh29-5h37-fv8m
js-yaml has prototype pollution in merge (<<) - https://github.com/advisories/GHSA-mh29-5h37-fv8m
fix available via `npm audit fix`
node_modules/@eslint/eslintrc/node_modules/js-yaml
node_modules/eslint/node_modules/js-yaml
node_modules/js-yaml

2 vulnerabilities (1 low, 1 moderate)

To address all issues, run:
  npm audit fix