feat: unit conversion + random generators packs (7 new commands)

Two pure-Lua packs that don't need network or LLM — pure offline utilities.

unit_convert (resources/commands/unit_convert/, 4 commands)
  - convert.length      "переведи 100 метров в футы" / "сколько 5 миль в км"
                        meters↔feet, km↔miles. Pluralises russian unit names.
  - convert.weight      "переведи 70 кг в фунты"
                        kg↔lbs.
  - convert.temperature "переведи 100 цельсий в фаренгейт" / "минус 40 в цельсий"
                        Handles negative numbers. C↔F formulas inline.
  - convert.speed       "переведи 100 км в час в мили в час"
                        km/h↔mph.
  - All round results to 1-2 decimal places, speak with proper Russian
    grammatical number (фут/фута/футов).

generators (resources/commands/generators/, 3 commands)
  - gen.coin       "подбрось монету" / "орёл или решка"
                   → "Орёл!" or "Решка!" (math.random with time+minute seed)
  - gen.password   "сгенерируй пароль 16 символов"
                   → cryptographically-ish 6..64-char password,
                   alphanumeric + !@#$%^&*-_=+, copies to clipboard,
                   SPEAKS LENGTH ONLY (never echoes the password).
                   Default 16 chars if no number in phrase.
  - gen.uuid       "сгенерируй uuid" / "юид"
                   → v4 UUID, copies to clipboard, speaks last 4 chars
                   (confirmation without 32-char monologue).

Tests: 112/112 pass (commands::tests auto-validates).
Pack count: 62 → 64.

resources/commands/generators/command.toml

@@ -0,0 +1,54 @@
+# Random generators — coin flip, password, secret token, color.
+
+[[commands]]
+id = "gen.coin"
+type = "lua"
+script = "coin.lua"
+sandbox = "minimal"
+timeout = 2000
+
+[commands.phrases]
+ru = [
+    "подбрось монету",
+    "брось монетку",
+    "орёл или решка",
+    "монетка",
+]
+en = ["flip a coin", "coin flip", "heads or tails"]
+ua = ["підкинь монетку"]
+
+
+[[commands]]
+id = "gen.password"
+type = "lua"
+script = "password.lua"
+sandbox = "full"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "сгенерируй пароль",
+    "придумай пароль",
+    "пароль 12 символов",
+    "сгенерируй надёжный пароль",
+]
+en = ["generate password", "make a password"]
+ua = ["згенеруй пароль"]
+
+
+[[commands]]
+id = "gen.uuid"
+type = "lua"
+script = "uuid.lua"
+sandbox = "full"
+timeout = 3000
+
+[commands.phrases]
+ru = [
+    "сгенерируй uuid",
+    "сгенерируй юид",
+    "юид",
+    "уникальный идентификатор",
+]
+en = ["generate uuid", "uuid"]
+ua = ["згенеруй юід"]