feat(260329-uos): add word lists for levels 7-16 and fallback letter intros

- Add German word lists for levels 7-16 (10 words each, max 5 chars)
- All words validated against allowed keys per level
- Level 16 uses short words with period for punctuation practice
- Add 19 new fallback letter introductions (r,u,t,z,w,o,q,p,n,b,v,m,c,x,ä,ü,y,, ,.)
- Update entry count comment to 32 entries (levels 1-16)

src/game/words.ts

@@ -19,6 +19,26 @@ export const wordsByLevel: Record<number, string[]> = {
 	5: ["glas", "lag", "gah", "hag", "gal", "sah", "hals", "has", "gash", "flags"],
 	// Level 6: f, j, d, k, s, l, a, ö, g, h, e, i -- "eis", "die", "sie", "lied", "fies"
 	6: ["eis", "die", "sie", "lied", "fies", "dies", "sei", "geld", "held", "lieh"],
+	// Level 7: +r, u -- bekannt: f,j,d,k,s,l,a,ö,g,h,e,i,r,u
+	7: ["ruhe", "reis", "reif", "rief", "drei", "fuhr", "ufer", "krug", "raus", "seid"],
+	// Level 8: +t, z -- bekannt: ...+t,z
+	8: ["zeit", "ziel", "tier", "tief", "fest", "rest", "sitz", "reist", "hitze", "kreuz"],
+	// Level 9: +w, o -- bekannt: ...+w,o
+	9: ["wort", "rose", "dorf", "wohl", "dort", "rost", "ohr", "trotz", "woher", "forst"],
+	// Level 10: +q, p -- bekannt: ...+q,p
+	10: ["topf", "kopf", "post", "opfer", "sport", "preis", "quer", "pfad", "prost", "stopp"],
+	// Level 11: +n, b -- bekannt: ...+n,b
+	11: ["bein", "nein", "blind", "braun", "brot", "nebst", "brand", "oben", "born", "binde"],
+	// Level 12: +v, m -- bekannt: ...+v,m
+	12: ["vorn", "helm", "form", "viel", "mein", "warm", "stimm", "vater", "mund", "monat"],
+	// Level 13: +c, x -- bekannt: ...+c,x
+	13: ["dach", "nach", "buch", "fach", "noch", "text", "wachs", "mach", "nixe", "hexe"],
+	// Level 14: +ä, ü -- bekannt: ...+ä,ü
+	14: ["über", "übel", "grün", "kühl", "spät", "wählt", "würde", "trägt", "fährt", "hüpft"],
+	// Level 15: +y, "," -- bekannt: ...+y (Komma in Wörtern selten, echte Wörter mit y)
+	15: ["baby", "typ", "yoga", "party", "handy", "hobby", "yacht", "lyrik", "idyll", "hymne"],
+	// Level 16: +"." -- Punkt als Satzzeichen üben, kurze Wörter mit Punkt
+	16: ["da.", "so.", "gut.", "ja.", "hier.", "dort.", "fein.", "wohl.", "mein.", "doch."],
 };
 
 /**