I could see this going either way, but it would, I think, take some house-ruling either way.
Method 1: Aura Conductivity[ Spoiler ]
Auras are conductive; the spell can take effect if the user can bring his Aura to within 1m of the target's aura. "Touch" range spells thus have an actual range of Reach +1m, as if they were wielding a three-foot sword. The magician thus becomes as dangerous as a grenade; but the target may attempt to evade him as such.
The magician rolls his spellcasting as normal. The target may roll Dodge with a malus. If the target's Dodge successes equal or exceed the magician's spellcasting successes (or just exceed, if you want to be nicer to the magician,) the spell fails completely. Otherwise, however, if the target's Dodge successes do not equal or exceed the Spellcasting successes, the spell takes effect at the full number of Spellcasting successes rolled. Thus, dodging is possible, but is an all-or-nothing proposition.
The malus to the target's Dodge roll is -2 if they're 1m from the target's Reach. Note that this includes the Reach of any melee weapon the magician is wielding, such as a staff. For every point of Reach beneath that they are from the target, they take an additional -2 penalty. Thus, the most hosed person in the world is the gnome within his own punching distance of a troll magician wielding a staff.
With this method, the magician must focus on the spell to such a degree - and the discharge of the conductive auras is so great - that making a melee attack efficacious in combination is impossible. But you can still use a melee weapon to extend the reach of your Touch-ranged spells. With this method, Touch spells would tend to have wizz-BANG visual and audio displays, for added WIZARDRY.
Method 2: Direct Contact[ Spoiler ]
With this method, direct contact is required. You must place your hand, or at least a melee weapon you are wielding, in physical contact with the target's aura - IE, a seperation between the two of you of no more than about 4cm or so. The target must be within your Reach, and may attempt to dodge as normal. If they unwisely attempt to parry instead, the spell goes off automatically!
To make a simple Touch attack with your bare hands and just deliver the spell, you only require your normal Spellcasting roll, you do not need to use the Unarmed skill. Roll it as normal; the target may attempt to Dodge the spell, at a -2 penalty. If they equal or exceed (or, magician-friendly, only exceed,) your number of Spellcasting successes, they evade the spell, and if they do not, the spell takes full effect with the number of Spellcasting successes you rolled. You may also use Spellcasting alone if you just want to make aura contact with a wielded weapon, but in this case, your Spellcasting dice are capped at double your melee attack dice. (If you're fucking incompetent with a stick, you're not gonna be able to hit the guy with a staff.)
You can make a melee attack and nail the follow-through to boot. However, it's more difficult. To do so, you must make both a Spellcasting roll and an appropriate Unarmed/Melee Weapon roll. Both rolls are made at a -2 penalty. If you fail to garner any spellcasting successes, you might still do some damage with the weapon, but if you fail to garner any melee successes, you whiff entirely, of course. If the target Parries, they may avoid your melee damage, but the spell takes effect automatically; if the target dodges, they reduce your melee successes normally, and if they reduce your melee successes to zero, you whiff entirely.