### Solution:

#### Part (Ⅰ): Finding the Equation of the Ellipse $C$

Given the eccentricity $e = \frac{\sqrt{2}}{2}$, we have the relationship between the semi-major axis $a$, semi-minor axis $b$, and the linear eccentricity $c$ as follows:

1. The eccentricity formula $e = \frac{c}{a}$ gives us $a = \sqrt{2}c$.
2. The relationship between $a$, $b$, and $c$ is $c^2 = a^2 - b^2$, which simplifies to $a = \sqrt{2}b$ when substituting the expression for $a$ from step 1.
3. The area of the rhombus formed by the vertices of the ellipse is given by $\frac{1}{2} \times 2a \times 2b = 2\sqrt{2}$, leading to the equation $ab = \sqrt{2}$.

Solving these equations simultaneously, we find that $a = \sqrt{2}$ and $b = 1$. Therefore, the equation of the ellipse $C$ is:

$$\boxed{\frac{x^2}{2} + y^2 = 1}$$

#### Part (Ⅱ): Proving the Line $l$ Passes Through a Fixed Point

Given the upper vertex of the ellipse is $A(0,1)$, let the points of intersection of line $l$ with the ellipse be $P(x_1, y_1)$ and $Q(x_2, y_2)$. The equation of line $AP$ can be written as:

$$y = \frac{y_1 - 1}{x_1}x + 1$$

Setting $y = 0$ to find the $x$-coordinate of point $M$, we get:

$$x_M = -\frac{x_1}{y_1 - 1}$$

Given $y_1 = kx_1 + t$, we can express $|OM|$ as:

$$|OM| = \left|\frac{x_1}{kx_1 + t - 1}\right|$$

Similarly, for point $N$, we have:

$$|ON| = \left|\frac{x_2}{kx_2 + t - 1}\right|$$

Solving the system of equations $\left\{\begin{array}{l}y = kx + t \\ \frac{x^2}{2} + y^2 = 1\end{array}\right.$ and eliminating $y$, we obtain a quadratic equation in $x$:

$$(1 + 2k^2)x^2 + 4ktx + 2t^2 - 2 = 0$$

From this, we find the sum and product of roots as:

$$x_1 + x_2 = -\frac{4kt}{1 + 2k^2}$$
$$x_1x_2 = \frac{2t^2 - 2}{1 + 2k^2}$$

Therefore, the product $|OM|\cdot |ON|$ can be simplified to:

$$|OM|\cdot |ON| = \left|\frac{x_1x_2}{(kx_1 + t - 1)(kx_2 + t - 1)}\right| = \left|\frac{\frac{2t^2 - 2}{1 + 2k^2}}{k^2\frac{2t^2 - 2}{1 + 2k^2} + k(t - 1)\left(-\frac{4kt}{1 + 2k^2}\right) + (t - 1)^2}\right| = 2\left|\frac{t + 1}{t - 1}\right|$$

Given that $|OM|\cdot |ON| = 2$, we have:

$$2\left|\frac{t + 1}{t - 1}\right| = 2$$

Solving this equation, we find that $t = 0$. Therefore, the line $l$ passes through the fixed point $(0,0)$, which can be encapsulated as:

$$\boxed{\text{The line } l \text{ passes through the fixed point } (0,0)}$$