feat: Add Relationship Dynamics extension

[KenStarwind]

Summary

Adds a new ext/relationship_dynamics extension — an emotional engine for NPC-player relationships that separates permanent bonds (Affinity/Speed) from volatile attraction (Passion/RPM).

What it does

• RPM/Speed/Gears model: Passion accumulates per-interaction and drives affinity gain rate
• 5 love languages with primary/secondary NPC matching (acts_of_service, quality_time, words_of_affirmation, physical_touch, gifts)
• 13 temperaments (Romantic → Gentle) with per-temperament passion/reunion/jealousy multipliers
• 11 interest categories with per-NPC weights and topic-talk bonuses
• Environmental resonance via vector similarity (MiniMe/txtai embeddings against Oghma Infinium POI data)
• Combat passion — fighting together builds attraction, with temperament-specific bleedout responses (Bold NPCs get angry, Guarded NPCs get vulnerable)
• Diminishing returns — exponential session decay prevents spam-talking to max affinity
• Reunion system — time-apart spikes gated by affinity level, with IRL cooldown
• Jealousy + conflict/repair cycle — observed flirting triggers jealousy; repair interactions get 1.5x bonus
• 3 relationship stages (early/established/deep) with stage-appropriate context injection
• Demisexual/asexual type filtering — relationship preference constraints respected
• Full settings UI with per-subsystem toggles
• Per-NPC editor panel for love languages, interests, and temperament

Integration

All external dependencies are soft-gated — no hard requirements:

• Sharmat NsfwNpcData: class_exists() check
• MinAI conf_opts: try/catch
• Oghma table: try/catch
• MiniMe embeddings: HTTP call with fallback to keyword matching

Files changed

• .gitignore — added exception for ext/relationship_dynamics
• ext/relationship_dynamics/ — 9 new PHP files (core class, context builder, pre/post request hooks, settings, NPC editor section, install, API, debug)
• ui/core/config_hub.php — register extension in config hub
• ui/core/npc_master.php — hook NPC editor panel

Test plan

• Fresh install: visit Settings → Relationship Dynamics, verify defaults load
• NPC Editor: open any NPC, verify RelDyn panel appears with auto-generate button
• Talk to a follower NPC, verify passion accumulates in logs ([RelDyn-POST])
• Talk 10+ times in a row, verify diminishing returns
• Fight alongside follower, verify combat passion events log
• Verify no errors when Sharmat/MinAI/Oghma are not installed (soft gates)
• Save/reload game, verify passion values persist

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