Add emulator profiles and update docs

Add new emulator profiles (ares, BigPEmu, Eden, Model2, PrimeHack, Supermodel, Suyu, Xenia Canary, Yuzu) under emulators/*.yml with metadata, notes, file lists and exclusion/hle details. Update README counts (emulators/systems/files summary and auto-generated timestamp) and bump generated_at in database.json. Adjust mkdocs.yml navigation counts and add Yuzu entry to the Emulators nav.

emulators/model2.yml

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+emulator: Model 2 Emulator
+type: standalone
+source: closed-source
+upstream: closed-source
+profiled_date: "2026-03-26"
+core_version: "1.1a"
+display_name: "Model 2 Emulator (Sega Model 2)"
+cores:
+  - model2
+systems:
+  - sega-model2
+mode: standalone
+
+notes: |
+  Closed-source Sega Model 2 arcade emulator by ElSemi, formerly Nebula Model 2.
+  Emulates Model 2, 2A, 2B, and 2C hardware. Windows-only, runs via Proton on
+  Linux (EmuDeck setup). Last official release 1.1a (2014-01-02).
+
+  Uses MAME-format merged ROM sets. Each game ZIP contains all required ROMs
+  (program, geometry, texture, sound, protection chips). No shared parent BIOS
+  set exists for Sega Model 2 hardware; each game board has its own ROM chips.
+
+  EmuDeck packages version 1.1c from SeongGino/edc-repo0004. Installs to
+  romsPath/model2/ with emulator_multicpu.exe as main binary. Ships with
+  Lua scripts for game-specific patches (widescreen, fixes). No checkBIOS
+  entry in EmuDeck; EMULATOR.INI references only a roms/ subdirectory.
+
+  Source code never published. Original distribution via nebula.emulatronia.com
+  (archived). PhilrocWP/Model2 GitHub repo no longer exists.
+
+files: []
+
+exclusion_note: >
+  Uses MAME-format merged ROM sets where all required ROMs are contained within
+  each game's ZIP file. No standalone BIOS or firmware files are loaded by the
+  emulator. The Sega Model 2 hardware has no shared system BIOS; each game board
+  has its own set of program, geometry, texture, and sound ROMs.