feat: initialize Apex Theme System with build engine and Neovim template

- Set up project structure and Source of Truth (GEMINI.md).
- Implement DNA source files (src/*.yaml) with semantic color definitions.
- Build clinical light (Aeon) and high-contrast dark (Neon) specifications.
- Create Jinja2-based build system (build.py) using uv for reproducibility.
- Implement Neovim theme template mirroring the philosophy.

src/aeon.yaml

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+scheme: "Apex Aeon"
+author: "S0wlz (Owlibou)"
+type: "light"
+
+# Core Semantics (The DNA)
+palette:
+  background: "#f5f5f5" # Void White
+  foreground: "#0a0a0a" # Near Black
+  cursor:     "#ff0044" # Razor Red (Still the aggressor)
+  selection:  "#ff0044"
+  selection_fg: "#0a0a0a" # HARD RULE: Near Black on Red
+  
+  # Functional Roles
+  error:   "#ff0044"
+  success: "#00b377" # Darker for contrast on light bg
+  warning: "#d18f00" # Darker for contrast
+  info:    "#007a88" # Deep Cyan (Readable against white)
+  special: "#7a3cff"
+  azure:   "#005577"
+
+# UI Surfaces (Depth)
+ui:
+  panel:   "#e8e8e8" # Soft Surface
+  border:  "#737373" # Muted/Borders
+  high:    "#ffffff" # High Surface (Cards)
+  dim:     "#737373"
+  stealth: "#a0a0a0"
+
+# ANSI Table (Terminal)
+ansi:
+  normal:
+    black:   "#0a0a0a"
+    red:     "#ff0044"
+    green:   "#00b377"
+    yellow:  "#d18f00"
+    blue:    "#007a88"
+    magenta: "#7a3cff"
+    cyan:    "#007a88"
+    white:   "#f5f5f5"
+  
+  bright: # Escalation only
+    black:   "#737373"
+    red:     "#ff4d6d"
+    green:   "#33d6a6"
+    yellow:  "#ffbf40"
+    blue:    "#33bccc"
+    magenta: "#a680ff"
+    cyan:    "#33bccc"
+    white:   "#ffffff"

src/neon.yaml

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+scheme: "Apex Neon"
+author: "S0wlz (Owlibou)"
+type: "dark"
+
+# Core Semantics (The DNA)
+palette:
+  background: "#050505" # Void Black
+  foreground: "#ededed" # Stark White
+  cursor:     "#ff0044" # Razor Red (Primary Aggressor)
+  selection:  "#ff0044" # Target Locked
+  selection_fg: "#050505" # HARD RULE: Black text on Red
+  
+  # Functional Roles
+  error:   "#ff0044"
+  success: "#00ff99"
+  warning: "#ffb700"
+  info:    "#00eaff" # Electric Cyan
+  special: "#9d00ff" # Sacred Purple
+  azure:   "#0088cc" # Structural Blue
+
+# UI Surfaces (Depth)
+ui:
+  panel:   "#141414" # Inputs/Inactive Tabs
+  border:  "#262626" # Separators
+  dim:     "#737373" # Muted Text
+  stealth: "#404040" # Comments/Ignored
+
+# ANSI Table (Terminal)
+ansi:
+  normal:
+    black:   "#050505"
+    red:     "#ff0044"
+    green:   "#00ff99"
+    yellow:  "#ffb700"
+    blue:    "#00eaff"
+    magenta: "#9d00ff"
+    cyan:    "#00eaff" # Mapped to Blue/Info
+    white:   "#ededed"
+  
+  bright: # Escalation only
+    black:   "#262626"
+    red:     "#ff8899"
+    green:   "#2bffb2"
+    yellow:  "#ffd24d"
+    blue:    "#5af3ff"
+    magenta: "#c84dff"
+    cyan:    "#5af3ff"
+    white:   "#ffffff"